Members of Congress have started to review the whistleblower complaint about President Trump’s call with a foreign nation that spurred the House to launch a formal impeachment inquiry.

The complaint, which a source confirmed to be over Trump’s call with Ukrainian President Volodymyr Zelensky, was delivered to Congress after being requested by both the House and Senate Intelligence committees.

Members of the Senate Intelligence committee were going in and out of the Sensitive Compartmented Information Facility to review the complaint Wednesday afternoon. ADVERTISEMENT

One lawmaker said the complaint was 10 to 12 pages long.

Senate Minority Leader Chuck Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) told reporters the complaint is “very troubling.”

“All I’ll tell you is this. Two things: Number one, having read the documents in there, I’m even more worried about what happened than when I read the memorandum of the conversation. There are so many facts that have to be examined. It’s very troubling,” Schumer said.

Rep. Devin Nunes Devin Gerald NunesOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Trump nominates former Nunes aide to serve as intel community inspector general Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE (R-Calif.), the top Republican on the House Intelligence committee, had said the Director of National Intelligence was going transmit the complaint at 4 p.m.

Earlier Wednesday the White House released a memo with a partial transcript of Trump’s call with Zelensky that showed Trump asking 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.

Jordain Carney contributed