A supporter of President Trump, who allegedly made more than 2,000 threatening calls to members of Congress over the past three years, was arrested, according to charging documents obtained by the Associated Press.

In his phone calls, the man, Scott Brian Haven, allegedly threatened to kill members of Congress and went on obscenity-laced rants about Democrats apparent efforts to dismantle Trump’s presidency. In one phone call last month, Haven said he was standing right behind an unnamed member of Congress and he threatened that he was about to “shoot him in the head.”

“I’m going to do it now, are you ready?” he said, according to the charging documents, which did not mention the names or political parties of lawmakers he threatened.

Haven was arrested in Kaysville, Utah on Tuesday and was charged with interstate transmissions of threats to injure.

Read the charging documents, via the AP here.