Rep. Katherine Clark (D-Mass.) on Thursday became the highest-ranking member of House Democratic leadership to endorse an impeachment inquiry a day after former special counsel Robert Mueller’s testimony before Congress.

Clark, the House Democratic Caucus vice chair, ranks sixth in the leadership hierarchy.

Like other Democrats who also have endorsed an impeachment inquiry, Clark said that it should be the path forward given the Trump administration’s general refusal to cooperate with their investigations.

“I deeply respect the committee work of House Democrats to hold the President accountable, including hearings, subpoenas and lawsuits. All of our efforts to put the facts before the American people, however, have been met with unprecedented stonewalling and obstruction,” Clark said in a statement.