William Bradford, the man President Trump has appointed to head an office under the Department of Energy, has blamed "cyber attacks and Internet crimes" for derogatory comments made against former President Barack Obama Barack Hussein ObamaTwitter investigating automated image previews over apparent algorithmic bias Donald Trump delivers promise for less interventions in foreign policy Rush Limbaugh encourages Senate to skip hearings for Trump's SCOTUS nominee MORE by an online user appearing to be Bradford.

"I cannot comment on an ongoing federal investigation into multiple cyber attacks and Internet crimes committed against me over the past several years, to include email intrusions, hacking and impostors in social media,” Bradford told CNN on Monday.

His statement comes after CNN’s KFile unearthed various comments from a user appearing to be Bradford on the comment-hosting platform Disqus. CNN’s research connected the account to Bradford via Google cache.

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One of the comments from the user refers to Obama as “the son of a fourth-rate p&*n actress and w@!re."

Another comment from the same user says Obama’s birth certificate is “an obvious fake.”

"The 'birth certificate' released online 5 years ago is an obvious fake, and every intellectually honest person knows that. It was probably created to cover up the fact that his mother, Stanley Dunham, had an affair with Frank Davis and tried to fool Obama Sr by having the baby in Kenya,” the comment reads.

Bradford, who Trump appointed to head the Office of Indian Energy, came under scrutiny earlier this year for offensive tweets, including one where he referred to Obama as “a Kenyan creampuff,” as reported by The Washington Post.

The tweets caused several senators, including Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.), to call on Energy Secretary Rick Perry Rick PerryOVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project Senate votes to confirm Energy's No. 2 official MORE to fire Bradford.

“While he has since apologized for his deeply offensive and hurtful statements, we are concerned that Dr. Bradford’s character, as demonstrated by his past statements and writings, make him unfit to lead an important program like the Department’s Office of Indian Energy,” the senators wrote.