U.S. Sen. Michael Bennet joined 25 other senators in the Democratic caucus in calling for the Trump Administration to restore the Federal Election Commission to working order.

“Since Matthew Petersen resigned from the FEC on August 31st, the Commission has been without a quorum of commissioners,” reads the letter dated Jan. 15. “That’s 137 days without a fully functioning bipartisan agency to administer the laws that protect against corruption and foreign interference in our political system.”

The senators added: “It is past time to take action to restore a quorum.”

The FEC comprises six members, no more than three of whom can be from any one political party. The body requires four votes to take action. Enforcing and administering campaign finance laws are the core functions of the agency.

The letter from senators states that there are 35 cases currently before the FEC that pertain to alleged political spending by foreign nationals on which the commission cannot take action due to lack of quorum.

“This is unacceptable in any year, but especially so during an election year when our law enforcement and intelligence officials have warned that foreign adversaries are attempting to illegally influence our political system,” the letter reads.

U.S. Sen. Cory Gardner did not respond to a request for comment on whether he believes the White House should fill the vacancies.

In the absence of a governing majority, the remaining commissioners have taken to the media to litigate their differences in the past several months.

After news reports of President Donald Trump asking the Ukrainian president to announce a political investigation into his rival, former Vice President Joe Biden, the then-FEC Chair Ellen L. Weintraub wrote that “Anyone who solicits or accepts foreign assistance risks being on the wrong end of a federal investigation.”

That prompted the current chair, Caroline C. Hunter, a Republican, to label as “extreme” the statement of Weintraub, a Democrat.

“Weintraub’s interpretation of the law doesn’t properly consider the First Amendment — and to make it worse, she’s using radical measures to force her viewpoint,” Hunter wrote in POLITICO.

Colorado Politics reporter Ernest Luning contributed to this report.