Khizr Khan, the Gold Star father who gave an impassioned speech at the 2016 Democratic National Convention (DNC), reiterated Tuesday his call for President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE to brush up on the Constitution.

“My offer to Donald Trump to read the Constitution remains standing,” Khan said at a conference hosted by the progressive Center for American Progress, recalling the moment he held up his pocket Constitution at the DNC in July 2016.

“One more time, he has proven that he is unfamiliar with the basic tenets of democracy, our values," Khan added about the president on Tuesday.

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“We do make mistakes, like last election. We have made a mistake,” Khan said. “We will correct it. We are correcting it. Maybe this is an opportunity for all patriots to come together, all patriots to join hands.”

Khan urged Americans opposed to the president to continue to speak out.

“People ask me: ‘What do you advise under the current circumstances?’” Khan said. “This is my humble suggestion to all of us … Under these circumstances, all of us patriots need to remain standing in unity, support one another, continue to speak louder.”

Khan, who during his address called Virginia Gov. Terry McAuliffe (D) his “hero,” called on people to “support those candidates, support those office holders who fully understand your democracy, our democracy, our values.”

Both Khan and his wife Ghazala have endorsed Democratic candidate Tom Perriello in Virginia's gubernatorial race.