allen at the white house. >> reporter: no monday morning tariffs on mexico after president trump clinched an 11th hour immigration deal for tougher enforcement. tweeting, there's now going to be great cooperation between mexico and the u.s. mr. trump widely criticized for threatening tariffs blasted as false in a "new york times" report suggesting weeks of trade tension, in fact, had not accomplished that much. under the deal, mexico plans to deploy 6,000 troops across its southern border to stop migrants from central america. a senior administration official acknowledged to nbc news mexico already had pledged 5,400 troops. and mexico agreed to allow thousands of migrants seeking asylum in the u.s. to remain in or be returned to mexico while their legal cases proceed. an arrangement first agreed to by the u.s. and mexico back in december. what's new, an administration official says, is an expansion of mexico's commitments. >> he brought mexico to the table again. and what they're talking about, they're going to be doing, it's going to be a game changer. >> reporter: still, democrats campaigning in iowa, where farmers are getting hurt by trade tensions, also accusing mr. trump of solving a manu