At a rally in May in Panama City Beach, Fla., the president used some of his sharpest rhetoric ever about what he calls a "crisis" of undocumented migration: "How do you stop these people?" Someone in the crowd can be heard in video from the event responding "shoot them", to which Trump seemed to smile while saying, "That's only in the Panhandle you can get away with that stuff".
Just 13 hours later, another gunman killed nine people in downtown Dayton, Ohio.
He said he has been speaking to the United States attorney general, Federal Bureau of Investigation director and members of congress and will be making an additional statement later on Monday.
Trump also has been widely criticized for offering a false equivalency when discussing racial violence, notably when he said there were "very fine people, on both sides", after a white supremacist rally in Charlottesville, Virginia, that resulted in the death of an anti-racism demonstrator. "These sinister ideologies must be defeated. The magazines hold too many bullets, and they are coming to places like Dayton and El Paso, Walmarts, entertainment districts, churches like Mother Emanuel AME in SC and they are killing American citizens". "Hate has no place in America, hatred warps the mind, ravages the heart and devours the soul".
"We must honor the sacred memory of those we have lost by acting as one people", he said.
Later in his speech, the president called for the end of the "glorification of violence", focusing on the video game industry and said mental health laws must be reformed. But this is also a mental illness problem.
The U.S. House of Representatives already has passed a bill calling for universal background checks for gun buyers, but it has not been taken up by the Republican-led Senate.
In the El Paso attack, investigators are focusing on whether it was a hate crime after the emergence of a racist, anti-immigrant post that was put online shortly beforehand. The survey was conducted both before and after a mass shooting at two mosques in New Zealand.
Trump said bipartisan action is needed to reduce mass shootings.
He urges Democrats and Republicans to set aside partisanship and find solutions to violence. "Our future is in our control", Trump said.
"We have done much more than most administrations", he said, without elaboration. He called on social media companies to develop tools that can detect mass shooters "before they strike".
Booker accused Trump of fueling "racial bigotry and hatred" and called on him to do more to show he's "changed". "We are sickened by this monstrous evil, the cruelty, the hatred, the malice, the bloodshed, and the terror".
Gov. Gretchen Whitmer ordered US and MI flags be displayed at half mast this week to honor victims of the shootings.