President Donald Trump on Friday, Jan. 17, said Iranian leaders “should abandon terror and Make Iran Great Again!” instead of leading the country toward ruin.

President Trump made his suggestion after Iran’s Supreme Leader Ayatollah Ali Khamenei said the Trump administration merely pretends to back Iranian people, but would “stab them in the heart” with venomous daggers.

“The villainous U.S. govt repeatedly says that they are standing by the Iranian ppl. They lie. If you are standing by the Iranian ppl, it is only to stab them in the heart with your venomous daggers. Of course, you have so far failed to do so, & you will certainly continue to fail,” Khamenei wrote in a tweet.

In a response, President Trump warned that Khamenei should be “very careful with his words.”

“The so-called ‘Supreme Leader’ of Iran, who has not been so Supreme lately, had some nasty things to say about the United States and Europe,” President Trump replied in a tweet on Friday evening.

“Their economy is crashing, and their people are suffering. He should be very careful with his words!” the president added.

President Trump continued in a subsequent tweet, “The noble people of Iran—who love America—deserve a government that’s more interested in helping them achieve their dreams than killing them for demanding respect.”

“Instead of leading Iran toward ruin, its leaders should abandon terror and Make Iran Great Again!” he said.

According to The Hill, Khamenei earlier on Friday held his first sermon in Tehran in eight years to rail against the recent U.S. strike against Iranian Gen. Qassem Soleimani.

The regime’s supreme leader said the United States showed its terrorist nature in killing the commander Soleimani, adding that the “assassination” was a disgrace to the U.S. administration, CNBC reported.

Khamenei described Iran’s decision to attack military bases housing U.S. troops in Iraq earlier this month as a “day of God,” and its retaliatory missile attack on Iraqi bases had dealt a “blow to America’s image.”