A US government funding shutdown looked increasingly certain Thursday after Senate Democrats rejected a key procedural vote to express anger over the killing of two protesters against President Donald Trump's hardline immigration crackdown. It would be the second shutdown -- when funding for swaths of the US government are temporarily frozen -- since Trump took office a year ago. And Congress has the authority -- and the moral obligation -- to act," said Senate Democratic Minority Leader Chuck Schumer ahead of the vote. The House and Senate both have to approve the exact same bill texts before they can become law. Lawmakers have raised concerns about the consequences of a DHS shutdown for agencies such as the Federal Emergency Management Agency (FEMA) during severe winter weather.