Sen. Lindsay Graham (R-S.C.), one of 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’s most vocal allies in the Senate, on Thursday dismissed a whistleblower complaint that has led House Democrats to announce an impeachment inquiry but said it is “imperative” to determine which White House officials spoke with the anonymous whistleblower.

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“It is imperative we find out which White House official talked to the whistleblower and why. Why didn’t they lodge the complaint?” Graham tweeted Thursday.

“As to the other matters in complaint: Clearly a coordinated effort to take second-hand information to create a narrative damaging to the President. When I think of whistleblower complaints I generally think of someone with first-hand knowledge of the events in question,” he added.

Following the revelation of the complaint, which concerned a call between Trump and Ukrainian President Volodymyr Zelensky in which Trump discussed 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’s son Hunter, the White House released notes summarizing the call Wednesday morning.

The full whistleblower complaint was released to the House Intelligence Committee Wednesday before being made public Thursday morning.

In the complaint, the whistleblower said that they were told that senior White House officials intervened to “lock down” records of the phone call, and that White House officials were directed by White House lawyers to remove the electronic transcript from the computer system where they are customarily stored and put onto a separate system “that is otherwise used to store and handle classified information of an especially sensitive nature.”