President Donald Trump has continued to insist voter fraud is causing the election to be "stolen" from him -- but elected officials and one Long Island expert expressed worry over the claims.

Mail-in, provisional and military ballots are still being counted in states that will prove to be the deciders in the presidential election.

While some supporters have backed Trump's claims, which have been presented without evidence, retiring Republican Rep. Peter King has mixed feelings.

"The president shouldn't be alleging fraud until they actually find evidence of it," says King. "I think the president is right to, when it's that close, he owes it to his supporters 

and also to the country to make sure this is honestly done, but once the courts decide that should be it."

Election attorney and Hofstra Law professor James Sample says he's confident that election officials around the country are counting the votes correctly, and that each state has different election procedures for tabulation.

"Claims and false allegations that the process is irregular without evidence is not only false, but harmful to the democratic process and harmful to the nation," says Sample.

Sample says some states don't certify vote totals until the last two weeks of November, or the first week of December. He adds that with the presidential inauguration not until January, there's time to let the process play out and let every vote be counted.