Coons, the last Democrat on the panel to announce his position, said in a statement that he was encouraged by Pompeo’s commitment to the diplomatic corps that he laid out in his confirmation hearing but concluded that the current CIA director and former congressman would embolden rather than temper President Donald Trump’s most bellicose instincts.

“I do not make this decision lightly or without reservations,” Coons said in a statement. “I remain concerned that Director Pompeo will not challenge the President in critical moments. On vital decisions facing our country, Director Pompeo seems less concerned with rule of law and partnership with our allies and more inclined to emphasize unilateral action and the use of force.”

Coons also said he was concerned with some of Pompeo’s past statements made over his political career on “a range of issues.”