Biden wants Congress to take action on gun reform

Treasury Secretary Janet Yellen has called a meeting with top U.S. financial regulators to discuss the recent market volatility related to trading of GameStop, a Treasury spokesperson confirms to ABC News.

The meeting would be with officials from the Securities and Exchange Commission, the Commodity Futures Trading Commission, the Federal Reserve and the Federal Reserve Bank of New York, according to Treasury spokesperson Alexandra LaManna.

"Secretary Yellen believes the integrity of markets is important and has asked for a discussion of recent volatility in financial markets and whether recent activities are consistent with investor protection and fair and efficient markets," LaManna said in a statement to ABC News.

The meeting comes amid increased scrutiny in Washington of Robinhood’s decision to limit trading of certain stocks, including GameStop, after retail investors banded together to drive up prices. The House Financial Services Committee announced Monday it will hold a hearing later this month on market volatility and protections for retail investors.

-ABC News' Elizabeth Schulze

Biden visited the U.S. Capitol to pay his respects to the late-Capitol Police Officer Brian D. Sicknick, who is laying in honor in the Rotunda.

There was a brief arrival ceremony for Sicknick at about 9:30 p.m. and then some members of Congress paid their respect. A viewing period continues overnight for members of the U.S. Capitol Police.

Biden and first lady Jill Biden arrived at the Capitol shortly before 10 p.m. and walked into the Rotunda about 20 minutes later.

The president briefly touched Sicknick's urn and then the Bidens put their hands over their hearts. The couple then walked to flowers that were nearby and placed their hands over their hearts again. As the president dropped his hand to his side, he briefly shook his head. The Bidens left the Capitol moments later.

A congressional tribute will be held for Sicknick at 10:30 a.m. and a departure ceremony will take place at noon ahead of his interment.

-ABC News' Justin Gomez and Molly Nagle

New Secretary of Homeland Security Alejandro Mayorkas participated in a ceremonial swearing-in with Vice President Kamala Harris following his Senate confirmation and Biden signing immigration executive orders on Tuesday.

The ceremony took place in the office of the vice president in the Eisenhower Executive Office Building, adjacent to the White House. Mayorkas was joined by his wife Tanya and daughters, Giselle and Amelia.

Mayorkas is the first immigrant and first Latino to lead the Department of Homeland Security.

He was confirmed by the Senate in a vote of 56-43 earlier in the day.

Biden has signed three executive orders aimed at reforming the U.S. immigration system and rolling back his predecessor’s policies, including creating a task force aimed at reuniting children whom American authorities separated from their families on the border -- a policy which Biden called a "moral and national shame."

Chaired by the homeland security secretary, the task force will work to identify all families broken apart under the various forms of the Trump administration’s “zero-tolerance policy,” which separated children from relatives at the U.S. border, even before it became an official policy. It aims to manage family reunifications on a case-by-case basis, making different immigration benefit determinations for different families, a White House official said Monday.

Biden signed another order directing his administration to address the root causes of migration from Central America and to have the secretary of homeland security review the Trump administration’s Migrant Protection Protocols program, under which asylum seekers are sent to Mexico to wait for court appearances north of the border, the White House said. The third order calls for a review of the “public charge” rule former President Donald Trump tried to use to limit poor immigrants from coming to the country legally, according to the White House.

-ABC News' Ben Gittleson and Quinn Owen