Impeachment article has 200 cosponsors: US rep.

Two more senior Trump administration officials resigned following the president's remarks Wednesday and the violent assault on Capitol Hill that ensued, ABC News confirmed Saturday.

Anthony Ruggiero, the senior director for counterproliferation and biodefense on the National Security Council, resigned Thursday, a source familiar with the situation confirmed. He joins deputy national security adviser Matt Pottinger and other senior NSC officials who quit over Trump's comments.

The State Department lost its first assistant secretary over the week's events, too. Dr. Chris Ford, the top diplomat for arms control, resigned Friday, a second source familiar with the situation confirmed. 

The Washington Post reported that Ford originally announced his departure Wednesday morning but sent a follow-up note to staff Friday resigning immediately and condemning those in the administration who "are willing to condone, or even to incite, violent insurrection against the country I hold dear and whose Constitution I have taken a sacred oath to support and defend" -- a tacit reference to Trump.

-ABC News' Conor Finnegan

Republican former Maine Sen. Olympia Snowe has called on the president to resign following Wednesday's violent storming of the Capitol by a pro-Trump mob.

"President Trump should resign from office now to allow our nation to begin to heal and prepare for the transition to the Biden presidency," Snowe tweeted Saturday.

The former senator joins other Republicans, like Sen. Lisa Murkowski, R-Alaska, and Rep. Adam Kinzinger, R-Ill., in calling for the president to leave his post or for his removal before his term ends on Jan. 20.

Known as a moderate, Snowe served as senator from Maine between 1995 and 2013.

-ABC News' Benjamin Siegel

Federal law enforcement officials have advised police agencies in state capitals to increase their security posture at statehouses around the country following the riot at the US Capitol, law enforcement sources told ABC News.

The concern, the sources said, is an emboldened right-wing that considered Wednesday a success and may next turn to locations in closer to home.

Like the U.S. Capitol, statehouses are often backdrops for demonstrations that law enforcement officials now fear could turn violent.

“The safety of the Massachusetts State House, its employees and its neighbors is of utmost importance. As we witness the events in Washington, DC and across the nation, we are aware of the need to ensure the safety of this building and those who work within it. We continually assess our security needs and will adjust as necessary,” said Massachusetts Gov. Charlie Baker, Senate President Karen Spilka and House Speaker Ronald Mariano in a joint statement.

Across the country in Washington state, Gov. Jay Inslee activated the National Guard to patrol the Capitol Campus when the state legislature convenes Monday.

“As legislators begin their work on behalf of the people of the state of Washington, we must do whatever we can to ensure that they can do that work without fear, intimidation or harassment. The actions we saw in both Washington, D.C. and Olympia earlier this week were completely unacceptable and will not be repeated in our state capital again,” Inslee said.

Security was also increased around the statehouse in Maryland, Gov. Larry Hogan said.

“Maryland State Police as well as Maryland Capitol Police, some of which you see around here, have increased security around the Maryland State House complex, since there’s been a number of incidents at state capitols and governor’s mansions around the country,” Hogan said.

-ABC News' Aaron Katersky and Josh Margolin

Florida authorities say on Friday night they arrested one of the alleged Capitol rioters who was seen in a viral photograph carrying Speaker Nancy Pelosi’s lectern through the halls.

Adam Johnson, 36, of Parrish, Florida, is being held in Pinellas County Jail and charges are pending after federal marshals picked him up, according to arrest records.