WASHINGTON (Reuters) - President Donald Trump and Republican lawmakers took a tough stance on Saturday after the U.S. Congress failed to fund federal agencies, saying they would not negotiate on immigration until Democrats help end the government shutdown. Funding for federal agencies ran out at midnight with no agreement in Congress, meaning the second year of Donald Trump’s presidency began without a fully functioning government. Lawmakers failed to resolve an impasse over Democrats’ demands to include certain measures, including protections for young undocumented immigrants, in any short-term spending legislation. U.S. government workers were told to stay home or, in some...