Trump's speech on immigration follows his surprise trip to Mexico for a private meeting with the president.
Trump told the press they hadn't discussed payment of the plan.
Trump has been cutting into Clinton's lead as polls tighten.
Welcome to THE TRAIL 2016, your daily rundown from The Hill on all the latest news in the White House, Senate and House races.
In a stunning moment for the 2016 campaign, Donald Trump went into what could have been hostile...
The prominent Mexican TV news anchor is blasting Enrique Peña Nieto.
The visit came as a complete shock to even die-hard political observers.
Howard Wolfson called Trump's address "presidential" and a "home run."
"We didn't discuss payment of the wall," Trump said.
Trump also acknowledged weapon smuggling as a problem.
He called ending illegal immigration a "shared objective."