Donald Trump continues to lead his opponents in the race for the Republican presidential nomination, but an overwhelming majority of voters think the New York billionaire is not ready to be president.

According to a new Rasmussen Reports survey, only 27 percent of voters think Trump is prepared to be commander-in-chief, while 66 percent say he is not. The reality TV host-turned-White House hopeful has never occupied public office and has long been criticized for his lack of policy knowledge and understanding of foreign and domestic affairs.

Trump's closest competitor, Texas Sen. Ted Cruz, is viewed as slightly more prepared for the job, with 40 percent of voters saying the first-term senator is ready to occupy the Oval Office.

Meanwhile, a majority of voters (54 percent) think John Kasich, the two-term governor of Ohio who previously served in Congress, is ready to be president.

Among all of the candidates for president that remain in the race, Kasich is the only White House hopeful seen as qualified to be president by 50 percent or more of likely U.S. voters.

Fifty percent think Democratic presidential front-runner Hillary Clinton is ready to be president, while 48 percent say the same of her rival, Vermont Sen. Bernie Sanders.

The survey of 1,000 likely U.S. voters was conducted between April 7-10. Results contain a margin of error is plus or minus 3 percentage points.