Donald Trump is no friend of American Muslims, as he’s proven time and again in words and deeds. While offering few details, the Republican nominee called for surveillance of “certain mosques” and said he would consider a federal database to track all U.S. Muslims after last November’s Paris attacks.

Then, after the San Bernardino shooting last December, he called for a “total and complete shutdown of Muslims entering the United States” until American leaders can “figure out what the hell’s going on.” (Trump has since offered numerous contradictory revisions to that plan.) Leaders from across the political spectrum condemned the idea, including Trump’s future running mate Indiana Governor Mike Pence, who called it “offensive and unconstitutional." (He’s since changed his mind, as has most of the Republican Party.)

You’d think it would be hard to top Trump's track record. But one of his main advisors on terrorism found a way to one-up him:

Former New York City Mayor Rudy Giuliani on Wednesday said he would be in favor of forcing Muslims on the federal government's terrorism watch list to wear electronic monitoring tags or bracelets for authorities to track their whereabouts. "I would think that's an excellent idea," said Giuliani, an adviser to Republican presidential nominee Donald Trump. "If you're on the terror watch list, I should you know you're on the terror watch list. You're on there for a reason." Giuliani, who is advising the Trump campaign on terrorism and national security issues, told NJ Advance Media he would recommend that Trump undertake the same measures being used in France if he's elected.

When it comes to constitutionally fraught methods of surveillance, Giuliani also speaks from experience. “I was the mayor who put police officers in mosques, in New York and New Jersey,” he told the Intercept earlier this month. “After the 1993 bombing of the World Trade Center by Islamic extremist terrorists from New Jersey, I did it in early January of 1994.” Their presence stopped “three or four attacks,” he told the Intercept, but declined to offer further details.