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Demonstrators carry signs protesting U.S. President Donald Trump at the March for Science in Ann Arbor on April 22, 2017.

(Ryan Stanton | The Ann Arbor News)

People across the United States are planning to gather for a national day of "Impeachment Marches" to demand the impeachment of Donald Trump.

Ann Arbor and Detroit are now among the dozens of cities where marches are to be held in a few weeks, according to a list of marches happening.

A group known as Stop Trump Ann Arbor is organizing the Ann Arbor march, which is taking place from noon to 2 p.m. Sunday, July 2.

Sign-carrying demonstrators are expected to gather on the University of Michigan's Central Campus Diag, which has been the site of several anti-Trump demonstrations in recent months.

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"Stop Trump Ann Arbor invites all individuals and organizations to join us in expressing our collective outrage at what the Trump Administration is doing to our country and world," states the Facebook page for the event, listing reasons why the group thinks Trump should be impeached, including alleging he committed obstruction of justice by firing FBI Director James Comey.

The Metro Detroit Political Action Network is organizing the march in Detroit, which is taking place from noon to 3 p.m. July 2. Demonstrators are expected to gather at the Joe Louis fist monument on Woodward Avenue.

"We cannot abide a Congress that turns a blind eye to the constitutional breaches of our Commander in Chief," states the Facebook page for the event.

"We demand that Congress does its job and commences with impeachment proceedings immediately."

Other cities where marches are planned include Asheville, Austin, Buffalo, Cleveland, Denver, Knoxville, Las Vegas, Los Angeles, Memphis, Milwaukee, New Orleans, New York, Omaha, Palm Beach, Philadelphia, Portland, Sacramento, Salt Lake City, San Antonio, San Diego, San Francisco, Seattle and others.

Trump offered his latest thoughts on Comey in a tweet Sunday morning, June 11, saying, "I believe the James Comey leaks will be far more prevalent than anyone ever thought possible. Totally illegal? Very 'cowardly!' "

The president then followed up with, "The Democrats have no message, not on economics, not on taxes, not on jobs, not on failing #Obamacare. They are only OBSTRUCTIONISTS!"