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Bolton addresses reporters in the White House. Photo: Liu Jie/Xinhua via Getty Images

Former national security adviser John Bolton "refused" to submit a sworn affidavit "describing what he observed in terms of the president's Ukraine misconduct" to House Democrats after the Senate voted not to hear witnesses in President Trump's impeachment trial, Rep. Adam Schiff (D-Calif.) told MSNBC on Wednesday.

Driving the news: Nadler said Wednesday it is "likely" House Democrats will subpoena Bolton and continue investigations into Trump's hold on military aid to Ukraine. Schiff told "The Rachel Maddow Show" that no decision had been made to subpoena Bolton.

What he's saying: ""For whatever reason, [Bolton] apparently was willing to testify before the Senate, but apart from that, seems intent on saving it for his book," Schiff told host Rachel Maddow. "He'll have to answer for that, but at this point we have not made a decision about whether or not to move forward with a subpoena, but it is certainly something that we will be discussing."

Flashback: Bolton said Monday that he would testify in Trump's impeachment trial should the Senate issue a subpoena.

The big picture: The Senate acquitted Trump of abuse of power and obstruction of Congress on Wednesday, with nearly every Republican declining to pursue new information about Trump's Ukraine activities.

Go deeper: Nadler says House Democrats will "likely" subpoena Bolton

Go deeper

Updated 20 mins ago - Politics & Policy

Inauguration Day dashboard

U.S. Capitol and stage are lit at sunrise ahead of the inauguration of Joe Biden. Photo: Patrick Semansky - Pool/Getty Images

President Biden has delivered his inaugural address at the Capitol, calling for an end to the politics as total war but warning that "we have far to go" to heal the country.

What's next: Biden, Harris and nearly all the living former presidents and their spouses lay a wreath at Arlington National Cemetery.

Inaugural address: Biden vows to be "a president for all Americans"

Moments after taking the oath of office, President Biden sought to soothe a nation riven by political divisions and a global pandemic, while warning that "we have far to go" to heal the country and defeat a "virus that silently stalks the the country."

Why it matters: From the same steps that a pro-Trump mob launched an assault on Congress two weeks earlier, the new president paid deference to the endurance of American political institutions.

Updated 3 hours ago - Politics & Policy

In photos: The Biden and Harris inauguration

Joe Biden is sworn in as the 46th president of the United States. Photo: Alex Wong/Getty Images

Joe Biden and Kamala Harris were inaugurated as president and vice president respectively in a ceremony at the U.S. Capitol on Wednesday morning.

Why it matters: Top Democrats and Republicans gathered for the peaceful transfer of power only two weeks after an unprecedented siege on the building by Trump supporters to disrupt certification of Biden's victory. Trump did not attend Wednesday's ceremony.