President Donald Trump says he is his own best spokesman, but the American people don't see it that way, according to a new poll.

Trump is probably "his own worst mouthpiece," a spokesman for the Monmouth University poll said in a news release. Sixty-one percent of Americans say he "does more to hurt his own cause when he speaks on behalf of the administration" and only 33 percent say he does more to help himself, the latest Monmouth poll finds.

Forty-two percent of Americans say White House Press Secretary Sean Spicer hurts rather than helps the president, while 28 percent say he does more good than harm to Trump. Three out of 10 have no opinion.

Senior White House adviser Kellyanne Conway also gets poor ratings. Forty percent say she hurts Trump and 28 percent say she helps, according to the poll.

"This is the epitome of a no-win situation," says Patrick Murray, director of the Monmouth University Polling Institute in West Long Branch, N.J. "It's not as if Trump's appointed spokespeople are doing worse than the man himself. It may simply be an impossible task to represent this president and come off as credible."

These findings tend to undercut a pillar of Trump's evolving public relations strategy which he hopes will improve his mediocre public approval ratings. Members of his senior staff say Trump believes he is his own best spokesman, and White House sources say Trump wants to reduce the number of briefings by his underlings and hold more news conferences and give more speeches on his own. But the Monmouth poll suggests that this wouldn't be a winning strategy because Trump has such deep credibility problems with the public.

Vice President Mike Pence, however, is a bright spot. Fifty-three percent say Pence helps Trump with his public statements and 29 percent say he hurts.