Story highlights Trump had picked Clovis for the position despite him not having a background in science

Sources told CNN that Clovis' nomination was imperiled over his connections to the ongoing Russia probe

(CNN) Sam Clovis, President Donald Trump's nominee to be the Department of Agriculture's chief scientist, withdrew himself from consideration Thursday, the White House announced.

"We respect Mr. Clovis' decision to withdraw his nomination," White House press secretary Sarah Sanders said in a statement to pool reporters.

Trump had picked Clovis for the position despite him not having a background in science, and that lack of experience, alongside a history of racially charged and homophobic comments, made his nomination particularly controversial.

But sources told CNN earlier Thursday that Clovis' nomination was imperiled over his connections to the ongoing Russia probe. The development is the latest sign that Justice Department special counsel Robert Mueller's probe into the Trump campaign and Russian collusion is impacting the day-to-day of Trump's administration, despite top White House aides -- including Trump himself -- claiming that the indictments of former top Trump campaign advisers Paul Manafort and Rick Gates had nothing to do with the administration or the campaign.

"The political climate inside Washington has made it impossible for me to receive balanced and fair consideration for this position," Clovis wrote in a letter addressed to Trump that was dated Wednesday. "The relentless assaults on you and your team seem to be a blood sport that only increases in intensity each day. As I am focused on your success and the success of this administration, I do not want to be a distraction or negative influence, particularly with so much important work left to do for the American people."

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