The Oval Office meeting between Trump and Chinese vice premier Liu He followed reports that Trump and Xi might meet at Mar-a-Lago in March.
The Massachusetts senator and 2020 Democratic hopeful proposed a sweeping new system of nationwide child care that would cost $700 billion over 10 years, and be paid for by a tax on the country's wealthiest individuals.
Trump's national emergency declaration, criticized by Democrats and Republicans when he threatened it, could bring swift legal and legislative challenges.
President Donald Trump claimed the Democratic plan was one "of taking away your car, of taking away your airplane rights, of 'let's hop a train to California,' of you're not allowed to own cows anymore."
Warren has long been considered a top contender among Democrats in 2020, and Saturday's announcement marked the final step in a process that had been underway for months.
Schiller was hired by the RNC to help select a site for the 2020 convention. But once Charlotte, North Carolina, was announced in July, Schiller's firm was kept on to "work on other security needs for the committee," a party official told CNBC.
In a preview of Tuesday's speech, a White House official said Trump would adopt a "unifying, bipartisan, and optimistic tone." The official declined to say whether the president would declare a national emergency to build a border wall.
The president wouldn't say he would definitely declare an emergency, but he told reporters that such a declaration "does help the process."
"There's not going to be any wall money in the legislation," House Speaker Nancy Pelosi told reporters on Thursday morning. Hours later, Trump said, "If they don't give us a wall, it doesn't work."
The former Starbucks CEO and independent presidential hopeful offered an early glimpse Wednesday of his healthcare platform. Similar in many ways to Obamacare, Schultz's proposals could also be vulnerable to the same stumbling blocks.