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As a candidate for governor in 2009,Chris Christie was joined on the trail by former New York Mayor Rudy Giuliani. Now, both men are top advisers to GOP 2016 nominee Donald Trump. (AP Photo | Mel Evans)

(AP Photo/Mel Evans)

PHILADELPHIA -- 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.

One of two suspects who murdered a priest during an attack on a Catholic church in Normandy Tuesday morning was wearing just such a monitoring device during the attack. He was known to anti-terror authorities to have twice attempted a trip to Syria because he was wearing it.

Giuliani was appearing at an "RNC at the DNC" press event along with several other conservative leaders and officials, including U.S. Rep. Lee Zeldin of New York, all of whom argued that Democratic nominee Hillary Clinton was not adopting an appropriately muscular posture against terrorism and ISIS.

"I put undercover agents in mosques for the first time in January 1994," said Giuliani, in the wake of the February 1993 truck bombing of the World Trade Center that killed six and injured hundreds.

"I did it because the 1993 bombing was planned in a mosque in Union City, New Jersey, and a second plan was uncovered to bomb our subways, which was foiled," said Giuliani. "And I kept those police officers in those mosques until I left as mayor."

Claude Brodesser-Akner may be reached at cbrodesser@njadvancemedia.com. Follow him on Twitter @ClaudeBrodesser. Find NJ.com Politics on Facebook.