Vice President Mike Pence’s national security adviser and the supervisor of one of the witnesses who testified Tuesday in the House’s impeachment inquiry, released a statement stating that he was on President Donald Trump’s July 25 phone call with Ukrainian President Volodymyr Zelenskiy and that he heard nothing wrong or improper on the call.

Lt. Gen. Keith Kellogg’s statement came in response to Jennifer Williams, a career foreign service officer who was detailed to Pence’s office. He said that he had “no concerns” about the phone call.

“I was on the much-reported July 25 call between President Donald Trump and President Zelensky. As an exceedingly proud member of President Trump’s administration and as a 34-year highly experienced combat veteran who retired with the rank of Lieutenant General in the Army, I heard nothing wrong or improper on the call. I had and have no concerns,” Kellogg wrote.

“Ms. Williams was also on the call, and as she testified, she never reported any personal or professional concerns to me, her direct supervisor, regarding the call. In fact, she never reported any personal or professional concerns to any other member of the vice president’s staff, including our chief of staff and the vice president,” he added.

The Associated Press reported Williams testified in front of the House Intelligence Committee that “she considered the call “unusual” since it “involved discussion of what appeared to be a domestic political matter.””

President Donald Trump went after Williams on Sunday, tweeting, “Tell Jennifer Williams, whoever that is, to read BOTH transcripts of the presidential calls, & see the just released statement from Ukraine. Then she should meet with the other Never Trumpers, who I don’t know & mostly never even heard of, & work out a better presidential attack!”

Williams said she was confused by the president’s tweet and “would not” consider herself a “Never Trumper.”

In the now-infamous July phone call, President Trump asked Zelenskiy to open investigations into the alleged Ukrainian interference in 2016 U.S. election and former Vice President Joe Biden and his son’s business dealings in Ukraine. This prompted a whistleblower complaint and in turn, an impeachment inquiry in the House. The president’s request came after the military aid to the country had been stalled, which Democrats and some witnesses cited as a quid pro quo arrangement.