WASHINGTON (AP) — Giving himself credit for tough diplomacy, President Donald Trump is describing a burst of activity by Mexican authorities to keep Central American migrants from getting to the U.S. border.

That’s not backed up by facts as Trump retreats from his latest threat to seal off the U.S. from Mexico.

Trump was wrong when he said last week that Mexico was doing “NOTHING” about migrants coming north. It markedly tightened migration controls during the Obama administration and detained over 30,000 foreigners in the first three months of this year.

And it’s not evident now that Mexico has suddenly cracked down as a result of his threat, “apprehending everybody” and making “absolutely terrific progress” in just a matter of days, as Trump put it Friday. Mexico’s apprehensions of foreigners have not surged.

During his visit to the border in Southern California on Friday, Trump denounced a landmark immigration case he blamed on “Judge Flores, whoever you may be.” The case in question was named for Jenny Flores, a migrant teenager from El Salvador in the 1980s, not a judge.

There is no judge named Flores involved in the matter.

Trump, during his border visit, downplayed the claims of people seeking asylum at the border, declaring without evidence that many are gang members while comparing some of their efforts to find safety in the U.S. to special counsel Robert Mueller’s investigation of Russian interference in the 2016 elections.

“It’s a scam, it’s a hoax,” Trump said. “I know about hoaxes. I just went through a hoax.”