One top national security aide who listened to President Donald Trump’s July call with Ukraine’s president called it “improper.” Another said it was “unusual.” The two testified Tuesday at House impeachment hearings as the inquiry reached deeper into the White House.

Lt. Col. Alexander Vindman, an Army officer at the National Security Council, and Jennifer Williams, his counterpart at Vice President Mike Pence’s office, said they both had concerns as Trump spoke with the newly elected Ukrainian president about political investigations into Democrat Joe Biden.