WASHINGTON — President Trump said Sunday he's not planning to fire Special Counsel Robert Mueller — even as Trump lawyers raised objections to Mueller obtaining emails from Trump transition officials in his investigation into whether they colluded with Russian agents.

Returning from Camp David on Sunday night, Trump told reporters he's not happy with the way the investigation is being handled — and that transition emails were improperly turned over to investigators.

"Not looking good. It’s not looking good. It’s quite sad to see that. My people were very upset to see that," Trump said. "A lot of lawyers thought that was pretty sad.”

Trump was responding to a complaint that the General Services Administration had turned over to investigators thousands of pages of emails to and from Trump transition officials. The GSA is responsible for running presidential transitions, and the Trump officials were using government email accounts.

Trump transition lawyer Kory Langhofer complained to congressional committees that the emails should not have been turned over, but the GSA maintains that they were government records.

Trump also said he was confident that the emails wouldn't show any evidence that his campaign or transition teams colluded with Russia in the 2016 election. "I can’t imagine there’s anything on them, frankly, because as we said, there’s no collusion." he said.

Mueller's investigation has resulted in guilty pleas by former National Security Adviser Michael Flynn and campaign foreign policy adviser George Papadopoulos for lying to the FBI. Former Trump campaign chairman Paul Manafort and his deputy Rick Gates have been indicted for their activities lobbying for foreign governments, including Ukraine.

Speaking to reporters on the south lawn of the White House Sunday, Trump also addressed:

► Sen. John McCain's health. Trump said he had spoken to the wife of the ailing Arizona senator, who returned to Arizona Sunday to continue receiving treatment for brain cancer.

"I wish John well. I understand he'll come if we ever needed his vote, which hopefully we won't," Trump said. "He's going through a very tough time, no question about it."

► Cuba sanctions. Trump said Cuba continued to violate human rights and would be subject to continuing U.S. sanctions. Sunday is the second anniversary of President Barack Obama's partial lifting of those sanctions.

“Hopefully everything will normalize with Cuba, but right now, they are not doing the right thing. And when they don’t do the right thing, we’re not going to do the right thing," Trump said. "That’s all there is to it. We have to be strong with Cuba. The Cuban people are incredible people. They support me very strongly. But we’ll get Cuba straightened out.”