Rep. Hakeem Jeffries Hakeem Sekou JeffriesDemocratic leaders: Supreme Court fight is about ObamaCare Pelosi: House will stay in session until agreement is reached on coronavirus relief Races heat up for House leadership posts MORE (D-N.Y.), the chairman of the House Democratic Caucus, said Sunday that he believes more Republicans will start backing the impeachment inquiry launched into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

“I believe [more Republicans] will support us moving forward,” Jeffries said on CNN's "State of the Union."

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Jeffries also noted that more than 300 former national security officials have come out in support of an impeachment inquiry into Trump.

“The House is a separate and co-equal branch, we don’t work for this president,” Jeffries said.

“We have a responsibility to serve as a check and balance and these issues are serious,” he added.

The House impeachment inquiry was launched amid a whistleblower complaint alleging Trump pressured Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, a 2020 candidate, and his son. The complaint also claims that White House officials were directed to remove the transcripts of the calls from the system in which they are typically stored.

“The president has betrayed his oath of office. The president has abused his power in a manner that undermines our national security and the integrity of our elections,” Jeffries said on Sunday.

--This report was updated at 10:42 a.m.

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