Former Department of Homeland Security (DHS) Secretary Michael Chertoff said he’d “be guessing” whether President Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE would properly allow security professionals to deal with a crisis, Politico reported on Monday.

“If you go for a period of time without a crisis, often when a crisis occurs, you’re a little rusty, and one of the things we learned was to do a constant process of exercising, even in the absence of a real event, because that’s how you retain your muscle memory when you’re responding to an emergency,” Chertoff, who served in the George W. Bush administration, told the news outlet.

“And frankly, it’s something that this administration ought to consider doing as well,” he added.

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In a conservation for the “Off Message” podcast, Chertoff expressed faith in Trump aides such as Defense Secretary James Mattis and John Kelly, the man now serving in his old job as DHS secretary.

“I draw comfort from the fact that the leaders of the Department of Defense and the Department of Homeland Security have military experience, they’ve been in combat, they’re not going to get flustered, they understand how to make things work operationally,” Chertoff said.

Chertoff also said he viewed Trump’s travel ban, which blocked immigrants from seven predominantly Muslim countries in January, as rushed and not fully developed.

“I think it was kind of obvious, actually, that it was not fully baked when it was served,” Chertoff told Politico.

He added Trump’s reason for implementing the travel ban with no warning, to prevent potential terrorists from rushing in, was “perhaps overdramatic.”

Chertoff, a former judge, also felt Trump disrespected jurists who ruled against his travel ban.

“A president owes it to the Constitution, even if he disagrees, to be respectful. We don’t elect a president to be the king, we elect a president to play a role within a system,” Chertoff told Politico.

Chertoff expressed hope that his concerns prove wrong.

“If I’m proved wrong, that would be great,” he said.