The Trump administration on Thursday night urged the Supreme Court to strike down Obamacare, pushing forward with its attack on the health care law as millions of newly jobless Americans may come to depend on its coverage. The Justice Department in a new legal brief argues Obamacare in its entirety became invalid when the previous Republican-led Congress axed the unpopular individual mandate penalty for uninsured people. The filing comes weeks after President Donald Trump confirmed his administration would continue to press for Obamacare's elimination, ignoring warnings from top aides about the risk of voter backlash in November.