U.A. Ambassador to Germany Richard Grenell Richard GrenellA judge's Monsanto ruling affects both the law and the economy CNN's Tapper tried to talk GOP candidate out of running against Democratic incumbent: report Nobel prize committee's credibility is on the line MORE is calling out several journalists he says have blocked him on Twitter.

Grenell tweeted screenshots on Sunday that he had been blocked by NBC News journalists Chuck Todd Charles (Chuck) David ToddMurkowski: Supreme Court nominee should not be taken up before election Republican senator says plans to confirm justice before election 'completely consistent with the precedent' Sunday shows - Trump team defends coronavirus response MORE and Kristen Welker, as well as Mark Landler of The New York Times.

Mark Landler covers foreign policy for @nytimes. But he’s interested in covering the issues...he says. https://t.co/Dt7UZGLSsJ pic.twitter.com/R6Ilgfko6K — Richard Grenell (@RichardGrenell) August 11, 2019

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A source familiar with knowledge of the accounts told The Hill that the NBC journalists blocked Grenell years ago.

Spokespeople for the Times and NBC were not immediately available for comment.

Grenell’s Twitter has drawn controversy in years past.

He deleted hundreds of tweets in 2012 when he served as Mitt Romney Willard (Mitt) Mitt RomneyTrump 'no longer angry' at Romney because of Supreme Court stance GOP lawmakers distance themselves from Trump comments on transfer of power McConnell pushes back on Trump: 'There will be an orderly transition' MORE's presidential campaign's foreign policy and national security spokesman.

Screenshots shared by Business Insider at the time show one was aimed at another MSNBC host. “Rachel Maddow Rachel Anne MaddowGOP lawmakers distance themselves from Trump comments on transfer of power Schiff urges Trump administration members to resign: 'You cannot maintain your silence' Michael Cohen: Trump hates Obama because he's everything he 'wants to be' MORE needs to take a breath and put on a necklace,” it read.

He also criticized Todd, calling the "Meet the Press" host "a commercial for the Democratic Party & its radical feminist agenda," HuffPost reported at the time.

Grenell's wide-ranging Twitter attacks weren't limited to the media. “Did you notice that while Michelle Obama Michelle LeVaughn Robinson ObamaBlack stars reimagine 'Friends' to get out the vote Obama shares phone number to find out how Americans are planning to vote Michelle Obama: 'Don't listen to people who will say that somehow voting is rigged' MORE is working out on the BiggestLoser she is sweating on the East Room’s carpet? Just saying," he once tweeted.

They also weren't limited by party. He lashed out at former Speaker Newt Gingrich Newton (Newt) Leroy GingrichMORE, attacking the Georgia Republican's personal life, Politico reported.

He apologized at the time in a statement to Politico saying his “tongue-in-cheek” tweets were meant to be humorous, not hurtful.

Trump appointed Grenell as ambassador to Germany in 2017. He had previously served as a spokesman at the United Nations.