Democrats unveil resolution to impeach Trump, fearing a self-pardon

WASHINGTON, DC - JANUARY 06: Rioters enter the U.S. Capitol Building in Washington, DC. Congress held a joint session to ratify President-elect Joe Biden's 306-232 Electoral College win over President Donald Trump. Trump encouraged the protesters to come to Washington and addressed them decrying the
WASHINGTON, DC - JANUARY 06: Rioters enter the U.S. Capitol Building in Washington, DC. Congress held a joint session to ratify President-elect Joe Biden's 306-232 Electoral College win over President Donald Trump. Trump encouraged the protesters to come to Washington and addressed them decrying the "stolen" election. Now a group of Democrats is seeking his impeachment. (Photo by Win McNamee/Getty Images)

WASHINGTON — Among the factors undergirding the new effort by House Democrats to impeach President Donald Trump again is a controversial legal theory that doing so could bar him from pardoning himself, according to those involved.