WASHINGTON >> President Donald Trump says he has confidence in his secretary of state, even after suggesting he’s smarter than Rex Tillerson. Trump said in an interview published today that if Tillerson did call him a moron, as reported, the two should “compare IQ tests.”

“And I can tell you who is going to win,” Trump said to Forbes magazine in an interview published hours before Trump and Tillerson were to have lunch at the White House with Defense Secretary Jim Mattis.

Trump’s tense relationship with Tillerson burst into public view last week. An NBC News story claimed Vice President Mike Pence had to talk Tillerson out of resigning this summer, and that Tillerson had called Trump a “moron.”

Tillerson said he never considered resigning, though he didn’t directly address the reported insult. His spokeswoman later said he never used such language.

Trump has at times appeared to undercut Tillerson’s message on some of America’s most sensitive national security challenges, including Iran and North Korea.

“I told Rex Tillerson, our wonderful Secretary of State, that he is wasting his time trying to negotiate with Little Rocket Man,” Trump tweeted earlier this month, referring to the North’s leader, Kim Jong Un.

But responding to reporters’ questions during an Oval Office meeting with Henry Kissinger today, Trump insisted, “No, I didn’t undercut anybody. I don’t believe in undercutting people.”

Trump also said he continued to have confidence in Tillerson.

In the Forbes interview, conducted Friday, Trump responded to criticism that he’s undermined his secretary of state through his often provocative tweets that have interfered with ongoing diplomatic efforts. Tillerson also has publicly complained about the White House blocking him from making key appointments.

“I’m not undermining,” Trump told Forbes. “I think I’m actually strengthening authority.”

As for Tillerson’s reported “moron” comment, the president said, “I think it’s fake news. But if he did that, I guess we’ll have to compare IQ tests. And I can tell you who is going to win.”

State Department officials did not immediately respond to requests for comment.

The president launched a series of tweets on a wide range of topics this morning.

He said that reaching out to congressional Democrats for help in getting immigration legislation passed is difficult because “the Democrats don’t want secure borders.” In his tweet, Trump charged that Democrats “don’t care about safety for U.S.A.”

His Twitter post came only two days after Trump sent an immigration overhaul wish-list of legislative proposals to congressional leaders, including a requirement that Congress agree to a host of border security improvements and make significant changes to the green card program.

Trump had said on Sunday there need to be security enhancements — and the border wall that he’s demanded — before he’ll sign onto a bill restoring a program that shields from deportation young people brought to the United States as children and now here illegally.

Trump also said he would be acting on health care soon, saying: “I will be using the power of the pen to give great HealthCare to many people – FAST.” The White House has been finalizing an executive order that would expand health plans offered by associations to allow individuals to pool together and buy insurance outside their states.

The president also suggested the U.S. change its tax laws to punish organizations like the NFL if members are “disrespecting” the national anthem or flag. The NFL gave up its federal tax-exempt status a couple years ago and now files tax returns as a taxable entity.

Trump also tweeted today that ESPN ratings have “tanked” because of Jemele Hill, the anchor suspended for making political statements on social media. While NFL viewership is down slightly, ESPN remains among the most popular cable networks, averaging 3 million viewers in prime time.