William Cummings

USA TODAY

James Woolsey, who headed the CIA during the early years of the Bill Clinton administration, is making no secret of his opposition to another Clinton occupying the White House.

Woolsey joined Donald Trump's presidential campaign Monday as a senior adviser, the campaign announced in a statement in which Woolsey sharply criticized Hillary Clinton's record as secretary of State.

"Since Secretary Clinton left the State Department we have learned that she demonstrated a complete lack of understanding and an inability to lead the agency she headed in such a way as to maintain its mission and security," Woolsey said in the statement. "Based on the emails thus far released we know that Secretary Clinton also lacks the ability to lead her senior managers while complying with and maintaining the basic protocols designed to protect our government’s sensitive and classified information."

Woolsey served as Clinton's head of the CIA for two years, from 1993-1995. He complained about having little to no access to the president during his time at the head of the agency, according to The Wall Street Journal.

Woolsey said he has been a "'Scoop Jackson,' 'Joe Lieberman', Democrat all of my adult life," but he cited Trump's "commitment to reversing the harmful defense budget cuts signed into law by the current administration" as a reason he is supporting the Republican nominee.

"Mr. Trump understands the magnitude of the threats we face and is holding his cards close to the vest," Woolsey said.