Donald Trump on Tuesday said that he was “disappointed” in the results of a new study that showed a possible link between the virus that causes dengue and the vaccine given to millions of people around the world.

In an interview with Fox News, the Republican presidential nominee made the comment about the new study published Monday in the journal Science, saying that it had been conducted by a researcher who was not affiliated with his organization and had never received a grant from his organization.

“I was disappointed in the paper,” Trump said.

“It was published by a non-affiliated researcher, a researcher with no affiliation to my organization.

I thought he had a very poor study.”

The Trump campaign did not immediately respond to a request for comment from ABC News.

Trump said the study did not prove a connection between the new dengues vaccine and a more recent coronavirus outbreak that has sickened more than 11 million people.

“The only conclusion I can draw is that it’s a problem, that the vaccines have been effective,” he said.

“And the question is, when is the vaccine going to be effective?”

Trump said that the vaccine has been in use since the 1970s, when it was introduced in parts of the U.S. to help control dengushes.

It was also tested in countries like Australia and New Zealand.ABC News’ Mike Levine and The Associated Press contributed to this report.