A 'useful idiot' is a person in any country including the United States who willingly believes in ideas which can help Russia and/or hurt his/her own country. As used here, the term can include greedy persons who are bribed into specific actions and those who see a personal financial gain for themselves from an action. A 'Russian asset' is an employee of the Russian state residing in another country.
A 'siloviki' is a private person or government employee who owns and/or controls companies or state organizations in any country for the benefit of Vladimir Putin and shares in the benefits at Putin's discretion; that control is usually obtained by criminal methods which can include murder.
It is fair to say that some Republican and other United States Senators, Representatives and bureaucrats fit into one or more of these categories.
Since some of this cohort have real political power to affect or stall legislation, Biden's task is to find a way to enact legislation benefitting the National Interests of the United States with the cooperation of some of the Russian cohort; it is likely that they will impede actions which do not benefit Russia or their personal fortunes. They will probably not support actions which benefit the interests of only the United states.
Unless, one or more such persons - if they are enough to tip the scales and pass a proposal - can be convinced to do the right thing, it is probable that the United States will be compromised.
Perhaps some may be encouraged to support a proposal through a resignation campaign. Such a resignation campaign might consist of a dossier enumerating factual cases of illegal or morally repugnant actions.
When asked for their official support of a proposal or law that clearly benefits the United States, they can be presented with the dossier and asked to support the proposal in order to keep the dossier from the press.
While some may argue that such actions are 'dirty' politics, perhaps they are justified in today's political climate where National Interests are sacrificed routinely for private gain. Who is there that can make those fine distinctions in a time of crisis? The only answer is President Joe Biden.
Of course it may be unethical and perhaps illegal to use public resources like the FBI or CIA to create such dossiers; however, private investigators do not have those restraints.
And, many of the folks listed below are just personally political in their support and do not realize the effects of their actions, but some have considerable power and are worth pursuing. The underlying assumption is that support for trump and Russia will dissipate among some of these folks as Biden/Harris begin the change the political scene.
Since the list is so extensive it may seem that it just a political issue; but, the more influential of these folks may act to damage the National Interests of the United States.
Below is a list from wikipedia of some of the United States officials who MAY fit the categories above and thus be legitimate targets of such resignation campaigns:
[https://en.wikipedia.org/wiki/List_of_Donald_Trump_2020_presidential_campaign_endorsements]
CURRENT UNITED STATES SENATORS
Lamar Alexander, U.S. Senator from Tennessee (2003–present) and 45th Governor of Tennessee (1979–1987
John Barrasso, U.S. Senator from Wyoming (2007–present)
Marsha Blackburn, U.S. Senator from Tennessee (2019–present)
Roy Blunt, U.S. Senator from Missouri (2011–present)
John Boozman, U.S. Senator from Arkansas (2011–present)
Richard Burr, U.S. Senator from North Carolina (2005–present)
Shelley Moore Capito, U.S. Senator from West Virginia (2015–present)
Bill Cassidy, U.S. Senator from Louisiana (2015–present)
John Cornyn, U.S. Senator from Texas (2002–present) and Chair of the Senate Narcotics Caucus (2019–present)
Tom Cotton, U.S. Senator from Arkansas (2015–present)
Ted Cruz, U.S. Senator from Texas (2013–present)
Steve Daines, U.S. Senator from Montana (2015–present) and U.S. Representative from MT-AL (2013–2015)
Mike Enzi, U.S. Senator from Wyoming (1997–present)
Joni Ernst, U.S. Senator from Iowa (2015–present)
Deb Fischer, U.S. Senator from Nebraska (2013–present)
Cory Gardner, U.S. Senator from Colorado (2015–present) and U.S Representative from CO-4 (2011–2015)
Lindsey Graham, U.S. Senator from South Carolina (2003–present, U.S. Representative from SC-3 (1995–2003) and candidate for president in 2016
Chuck Grassley, U.S. Senator from Iowa and President pro tempore of the United States Senate (1981–present)
Josh Hawley, U.S. Senator from Missouri (2019–present)
Cindy Hyde-Smith, U.S. Senator from Mississippi (2018–present)
Jim Inhofe, U.S. Senator from Oklahoma (1994–present)
Ron Johnson, U.S. Senator from Wisconsin (2011–present) and Chair of the Senate Homeland Security and Governmental Affairs Committee (2015–present)
John Kennedy, U.S. Senator from Louisiana (2017–present)
James Lankford, U.S. Senator from Oklahoma (2015–present) and U.S. Representative from OK-5 (2011–2015)
Mike Lee, U.S. Senator from Utah (2011–present)
Kelly Loeffler, U.S. Senator from Georgia (2020–present)
Mitch McConnell, U.S. Senator from Kentucky (1985–present) and Senate Majority Leader (2015–present)[68]
Martha McSally, U.S. Senator from Arizona (2019–present) and U.S. Representative from AZ-02 (2015–2019)[69]
Rand Paul, U.S. Senator from Kentucky (2011–present)
David Perdue, U.S. Senator from Georgia (2015–present)
Rob Portman, U.S. Senator from Ohio (2011–present
Marco Rubio, U.S. Senator from Florida (2011–present)
Rick Scott, U.S. Senator from Florida (2019–present)
Tim Scott, U.S. Senator from South Carolina (2013–present)
Richard Shelby, U.S. Senator from Alabama (1987–present)
Dan Sullivan, U.S. Senator from Alaska (2015–present)
John Thune, Senate Majority Whip (2019–present) U.S. Senator from South Dakota (2005–present)
Thom Tillis, U.S. Senator from North Carolina (2015–present)
Pat Toomey, U.S. Senator from Pennsylvania (2011–present)
Roger Wicker, U.S. Senator from Mississippi (2007–present)
CURRENT FEDERAL OFFICIALS:
[Note - Footnotes can be found in the wikipedia line]
Alex Azar, United States Secretary of Health and Human Services (2018–present) and United States Deputy Secretary of Health and Human Services (2005–2007)[2]
David Bernhardt, United States Secretary of the Interior (2019–present) and United States Deputy Secretary of the Interior (2017–2019)[2]
Jovita Carranza, Administrator of the Small Business Administration (2020–present) and Treasurer of the United States (2017–2020)[2]
Ben Carson, Secretary of Housing and Urban Development (2017–present)[3]
Elaine Chao, United States Secretary of Transportation (2017–present) and United States Secretary of Labor (2001–2009)[4]
Betsy DeVos, United States Secretary of Education (2017–present)[5]
Richard Grenell, special envoy for the Serbia and Kosovo Peace Negotiations (2019–present)[6]
Keith Kellogg, National Security Advisor to the Vice President of the United States (2018–present)[3]
Larry Kudlow, Director of the National Economic Council (2018–present)[3]
Jared Kushner, Senior Advisor to the President (2017–present), Director of the Office of American Innovation (2017–present) and son-in-law to Donald Trump[7]
Kayleigh McEnany, White House Press Secretary (2020–present)[3]
Mick Mulvaney, United States Special Envoy for Northern Ireland (2020–present), White House Chief of Staff (2019–2020), director of the Office of Management and Budget (2017–2019)[8]
Peter Navarro, Director of the Office of Trade and Manufacturing Policy (2017–present) and Director of the National Trade Council (2017)[9]
Robert C. O'Brien, National Security Advisor (2019–present) and Special Envoy for Hostage Affairs (2017–2018)[10]
Sonny Perdue, United States Secretary of Agriculture (2017–present)[11]
Mike Pompeo, Secretary of State (2018–present), Director of the Central Intelligence Agency (2017–2018)[3]
Wilbur Ross, United States Secretary of Commerce (2017–present)[2]
Dan Scavino, White House Deputy Chief of Staff (2020–present)[3]
Ja'Ron Smith, Assistant to the President for domestic policy (2019–present)[3]
Ivanka Trump, Advisor to the President for women's issues policy (2017–present) and daughter of Donald Trump[12]
David Urban, Chair of the American Battle Monuments Commission (2018–present)[13]
Seema Verma, Administrator of the Centers for Medicare & Medicaid Services (2017–present)[14]
Robert Wilkie, United States Secretary of Veterans Affairs (2018–present) and Under Secretary of Defense for Personnel and Readiness (2017–2018)[2]
The wikipedai page includes several other categories as well.