WASHINGTON, DC — John Bolton raised the alarm about the firing of former US Ambassador to Ukraine Marie Yovanovitch last year — telling the House Foreign Affairs Committee to look into her sacking because he thought it was suspect.

New York Rep. Eliot Engel, the committee’s Democratic chairman, revealed Wednesday that Bolton called him in September, shortly after he was ousted as President Trump’s national security adviser, and “strongly implied” her dismissal was improper.

“President Trump is wrong that John Bolton didn’t say anything about the Trump-Ukraine Scandal at the time the President fired him. He said something to me,” Engel said in a statement released Wednesday morning.

“He and I spoke by telephone on September 23. On that call, Ambassador Bolton suggested to me — unprompted — that the committee look into the recall of Ambassador Marie Yovanovitch,” he continued later.

“He strongly implied that something improper had occurred around her removal as our top diplomat in Kyiv.”

Yovanovitch testified as part of the House inquiry that she was removed from her post following a smear campaign by Trump’s personal lawyer, Rudy Giuliani.

Engel said he informed the Foreign Affairs, Oversight and Intelligence committees about the call and it was one of the reasons they wanted Bolton to testify.

Bolton refused a House testimony request under the instruction of the White House and said he would only respond if he were subpoenaed. The House never did so, fearing a protracted legal battle, and the decision is now central to the impeachment trial.

Pressure is mounting for senators to vote to haul Bolton to Capitol Hill to testify in the impeachment trial. Bolton has said he would testify if subpoenaed.

In his upcoming memoir, the former White House aide claims Trump confessed that he was withholding $391 million in security assistance to Ukraine until officials there agreed to investigate political rival Joe Biden and his son Hunter.

The question of whether to call witnesses is roiling both parties. Democrats need just four Republicans to break with their party in order to reach a majority.

That vote won’t come until Friday, with most lawmakers keeping their cards close to the chest.