Sen. Claire McCaskill, the Democrat from Missouri, faced scrutiny on Thursday after tweeting that she had not met with Russian officials during the past 10 years — a statement that was contradicted by a tweet she wrote in January 2013 indicating that she was meeting with the Russian ambassador.

McCaskill's Thursday tweet was in response to reports that Attorney General Jeff Sessions had two meetings with Russia's ambassador to the US during the 2016 presidential campaign. Sessions had said during his confirmation hearing for attorney general that he "did not have communications with the Russians" while he served as a campaign surrogate for Donald Trump.

In her tweet, McCaskill said she never met or had a phone call "ever" with the Russian ambassador during her 10 years on the Senate Armed Services Committee:

I've been on the Armed Services Com for 10 years.No call or meeting w/Russian ambassador. Ever. Ambassadors call members of Foreign Rel Com. — Claire McCaskill (@clairecmc) March 2, 2017

But some quickly unearthed tweets seemed to contradict her claim:

Off to meeting w/Russian Ambassador. Upset about the arbitrary/cruel decision to end all US adoptions,even those in process. — Claire McCaskill (@clairecmc) January 30, 2013

Today calls with British, Russian, and German Ambassadors re: Iran deal. #doingmyhomework — Claire McCaskill (@clairecmc) August 6, 2015

McCaskill's tweets raise questions about how frequently and under which circumstances lawmakers meet with foreign ambassadors.

McCaskill later tweeted a response, saying she had never met "one on one" with the Russian ambassador in her capacity as a member of the Armed Services Committee.

Again, As senior member of Armed Serv, never received call or request from Russian Amb for meeting. Never met one on one w/him. — Claire McCaskill (@clairecmc) March 2, 2017

4 years ago went to meeting of many Senators about international adoptions. Russian Amb also attended. — Claire McCaskill (@clairecmc) March 2, 2017

McCaskill emphasized this distinction to reporters, saying she had met with the ambassador about adoptions and "it didn't have anything to do with Armed Services."

"The Russian ambassador has never called me as a member of the Armed Services Committee — he's never asked for a meeting with me, and I've never met with him one-on-one," McCaskill said.

Democratic lawmakers, including McCaskill, have begun to demand that Sessions resign from his position as attorney general, accusing him of lying to Congress and thus perjuring himself.

"A good prosecutor would have known these facts were relevant to the questions asked,” McCaskill said on Thursday morning. "It's clear Attorney General Sessions misled the Senate — the question is, why?"

Some leading Republicans, including Rep. Jason Chaffetz, who leads the House oversight committee, are also among lawmakers calling for Sessions to recuse himself from overseeing an investigation into President Donald Trump and his administration's ties to the Russian government.

Sessions denied the accusations and slapped away suggestions that he should recuse himself from the investigation or resign from office. He has argued that his comments during his confirmation hearing were meant to apply only to his role as a campaign surrogate and not as a senator.

"I have never met with any Russian officials to discuss issues of the campaign," Sessions said in a statement on Wednesday night. "I have no idea what this allegation is about. It is false."

Bryan Logan contributed to this report.

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