WASHINGTON — Facing a divided Congress for the first time, President Donald Trump on Tuesday called on Washington to reject “the politics of revenge, resistance and retribution.” He warned emboldened Democrats that “ridiculous partisan investigations” into his administration and businesses could hamper a surging American economy.Trump’s appeals for bipartisanship in his State of the Union address clashed with the rancorous atmosphere he has helped cultivate in the nation’s capital — as well as the desire of most Democrats to block his agenda during his next two years in office. Their opposition was on vivid display as Democratic congresswomen in the audience formed a sea of white in a nod to early 20th-century suffragettes.Trump spoke at a critical moment in his presidency, staring down a two-year stretch that will determine whether he is re-elected or leaves office in defeat. His speech sought to shore up Republican support that had eroded slightly during the recent government shutdown and previewed a fresh defense against Democrats as they ready a round of investigations into every aspect of his administration.“If there is going to be peace and legislation, there cannot be war and investigation,” he declared. Lawmakers in the cavernous House chamber sat largely silent.Looming over the president’s address was a fast-approaching Feb. 15 deadline to fund the government and avoid another shutdown. Democrats have refused to acquiesce to his demands for a border wall, and Republicans are increasingly unwilling to shut down the government to help him fulfill his signature campaign pledge. Nor does the GOP support the president’s plan to declare a national emergency if Congress won’t fund the wall.