Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) said Saturday that former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE should comply with any lawfully issued Senate subpoena after Biden suggested he would not do so. However, she also said the focus should remain on the officials the White House has ordered to defy subpoenas.

On the campaign trail in Iowa, the Massachusetts senator commented on Biden's involvement as a witness in the impending impeachment trial to a gaggle of press. A reporter for CBS, Zak Hudak, shared footage of the lawmaker on Twitter.

“Donald Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE is being impeached for abuse of power, and that’s where our focus should be. Shame on him for trying to switch this over to something else,” Warren told reporters in Iowa. “But Joe Biden has said that he has always abided by every lawful order, and if there’s a lawful order on a subpoena, then I assume he would follow it.”

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“Right now, we should be focusing on the subpoenas that have already been issued for [former White House counsel] Don McGahn and for [acting White House chief of staff] Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE, who have firsthand knowledge of what the president did,” she added.

“That’s where the testimony should come from in this impeachment trial, but that’s the part that [Senate Majority Leader] Mitch McConnell Addison (Mitch) Mitchell McConnellHawley warns Schumer to steer clear of Catholic-based criticisms of Barrett Senate GOP set to vote on Trump's Supreme Court pick before election Harris slams Trump's Supreme Court pick as an attempt to 'destroy the Affordable Care Act' MORE and the president just don’t want to put out there in public, and that’s wrong,” she said.

.@ewarren says if Congress issues @JoeBiden a subpoena in the impeachment trial, he should appear. "He has said he always follows lawfully issued orders, and if there is a lawfully issued order for a subpoena, then he should follow it" (Qs from @KimNorvellDMR & @AsteadWesley) pic.twitter.com/bI84WObmSm — Zak Hudak (@cbszak) December 29, 2019

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Asked to clarify whether she believed Biden should comply with any subpoenas, Warren responded, “He should, and I assume that he will follow it.”

Biden told the Des Moines Register that he would not comply with a subpoena in the Senate impeachment trial, telling the newspaper, “It's all designed to deal with Trump doing what he's done his whole life, trying to take the focus off him.”

He clarified his stance Saturday, tweeting, "I have always complied with a lawful order and in my eight years as VP, my office — unlike Donald Trump and Mike Pence Michael (Mike) Richard PenceFormer Pence aide: White House staffers discussed Trump refusing to leave office Pence vows for law and order everywhere Trump met with chants of protest as he pays respects to Ruth Bader Ginsburg MORE — cooperated with legitimate congressional oversight requests," but he added that he was “not going to pretend that there is any legal basis for Republican subpoenas for my testimony in the impeachment trial.”