(CNN) White House staff secretary Rob Porter, a top aide to President Donald Trump, has resigned, the White House confirmed Wednesday, following allegations of abuse from his two ex-wives.

Porter denied the allegations in a statement issued in the wake of his resignation.

"These outrageous allegations are simply false," he said in his statement. "I have been transparent and truthful about these vile claims, but I will not further engage publicly with a coordinated smear campaign."

Porter resigned over the objections of White House chief of staff John Kelly and others, a White House official said.

"Rob Porter is a man of true integrity and honor and I can't say enough good things about him. He is a friend, a confidante and a trusted professional. I am proud to serve alongside him," Kelly said in a statement.

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