WASHINGTON — In a pair of tweets before 6 a.m. on Tuesday, President Trump increased pressure on Democrats, reminding them of a countdown to strike a deal with Republicans so that young undocumented immigrants have a path to legally stay in the United States. He also appeared to suggest that if his recently unveiled infrastructure plan were unsuccessful, it would be the Democrats’ fault.

The threat on negotiations over the Obama-era program known as the Deferred Action for Childhood Arrivals, or DACA, comes as the Senate holds a rare open-ended debate on immigration. Mr. Trump ended the…

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