Live updates: Waltz stands firm on use of Signal in Houthi operation chat

Former national security adviser Mike Waltz, testifying before the Senate Foreign Relations Committee in his bid to become U.N. ambassador, stood by the use of Signal in a chat that discussed sensitive military details earlier this year.

Waltz, under questioning from Sen. Chris Coons (D-Del.), said no disciplinary action was taken against him or others in the March chat. He said the use of Signal stemmed from a Biden-era recommendation for using an end-to-end encrypted chat. The two disagreed over the nature of the information that was shared in that chat and whether it was appropriate to discuss it there.

President Trump will promote his energy and technology agenda on Tuesday in Pittsburgh at a summit organized by Sen. Dave McCormick (R-Pa.).

Trump and McCormick will announce $70 billion in investments for the state, according to reports, at the inaugural Pennsylvania Energy and Innovation Summit, which will bring together Cabinet officials and industry leaders. "Pennsylvania is spearheading the charge for American energy and AI dominance," the senator wrote in an op-ed Tuesday for Fox Digital. 

The Senate is pushing up against a Friday deadline to approve a rescissions package from the White House. Russ Vought, director of the Office of Management and Budget, is expected on the Hill to speak to Republican senators on the vote.

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Stick around here all day for updates.