At the same time, Trump also blamed the news media for "the anger and rage that has built up over many years". "We can never forget them, and those many who came before them", Trump wrote on Twitter ahead of his remarks, scheduled for 10 a.m. (1400 GMT).
The U.S. House of Representatives has passed a bill calling for universal background checks for gun buyers, and Senate Democratic leader Chuck Schumer on Sunday called on Senate Majority Leader Mitch McConnell to reconvene the chamber in an emergency session to pass the legislation.
Sen. Kirsten Gillibrand, a New York Democrat who is also seeking her party's 2020 presidential nomination, said Monday that it's "absurd" for Trump to link immigration and gun violence together.
Trump, who will make remarks later on Monday (US time), tweeted about the weekend shootings in Texas and OH that left 29 dead and dozens wounded.
United States legislators should pass tougher gun control laws and possibly "marry" them to immigration reform, President Donald Trump tweeted. Just 13 hours later, another gunman in downtown Dayton, Ohio, killed nine people. The shooter, a 24-year-old male, was shot and killed by responding officers. His administration has overseen a ban on so-called bump stocks, but has not pursued large-scale gun control efforts.
In the wake of this weekend's shootings, Democrats have renewed calls for greater gun control, including background checks.
After the Parkland, Florida, school shooting in February 2018, Congress did pass - and Mr. Trump signed - legislation to encourage states to submit more records into the national instant background check system, though many Democrats said that measure alone fell short of what was needed.
Trump's acting chief of staff, Mick Mulvaney, dismissed such connections Sunday, saying on NBC, "People are going to hear what they want to hear".