The entire D.C. National Guard has been activated by the Department of Defense to respond to the violent scene at the U.S. Capitol.

"The D.C. Guard has been mobilized to provide support to federal law enforcement in the District. Acting Secretary Miller has been in contact with congressional leadership, and Secretary McCarthy has been working with the D.C. government. The law enforcement response will be led by the Department of Justice," said chief Pentagon spokesman Jonathan Hoffman.

White House press secretary Kayleigh McEnany tweeted that Trump had directed the National Guard and other federal protective services to deploy -- but Trump has not called on protesters to leave as Vice President Mike Pence and others have.

In a joint statement from House Speaker Nancy Pelosi and Senate Minority Leader Schumer, the Democratic congressional leadership called on Trump to put an end to the chaos.

"We are calling on President Trump to demand that all protestors leave the U.S. Capitol and Capitol Grounds immediately," it said.

Trump so far has only called on his supporters to "stay peaceful" in a tweet. Meanwhile, a supporter of Trump's sat inside Pelosi's office as the breach of the building continued. A message was left for the speaker on a manila folder on her desk reading, "WE WILL NOT BACK DOWN."

Sources tell ABC News that a woman has been shot inside of the U.S. Capitol and has been seriously injured. It’s unclear what led to the shooting or if law enforcement was involved.

A source familiar with the situation said that D.C. Fire EMS are transporting a woman in critical condition to a local hospital.

-ABC News' Mike Levine and Luke Barr

Sources tell ABC News Trump is watching the storming of the Capitol protests on television at the White House, some close to President Trump beside themselves pushing him to do more to stop and condemn the violence playing out on Capitol Hill.

Many White House staffers avoided going to work Wednesday fearing events could be violent, and they did not want to be near the president who has been fuming for days.

Some sources tell ABC there is chatter among White House aides to personally resign as they can't stand by watching what is happening right now play out.

-ABC News' John Santucci and Katherine Faulders

House Speaker Nancy Pelosi, in a new letter to Democrats on Saturday, asked members to prepare to return to Washington this week -- another signal that the House could take up and pass the impeachment article to the Senate after it is formally introduced on Monday.

Pelosi thanked fellow Democratic representatives for speaking with her on a conference call Friday and said she was taking their considerations into account. She did not specifically mention voting on impeachment in the letter, though.

"Since that call, I have received scores of communications from Members expressing your views about how we go forward and regarding a strong presence of our Caucus in the Capitol," she wrote. "Over the last few days, I have discussed your views with Constitutional lawyers, both inside and outside the Congress, to consider the parliamentary and constitutional options available to us."

"From what I have heard from Members, and from the deluge that I have received from the public, it is clear that, once again, the Times Have Found Us to save our democracy," Pelosi added in the letter. "We will be proceeding with meetings with Members and Constitutional experts and others. I continue to welcome your comments. I urge you to be prepared to return to Washington this week."

While Democrats are hopeful Republicans will back their effort, none have come out and said they would back the charge as drafted.

Pelosi said at a press conference on Thursday, "If the Vice President and Cabinet do not act [on the 25th Amendment], the Congress may be prepared to move forward with impeachment."

Some Democrats planned to connect with Republican colleagues this weekend to gauge their support and encourage them to back the effort.

-ABC News' Benjamin Siegel