UPDATE 5-Senate Democrats back bill reopening U.S. government - Schumer

(Adds deal to reopen government)

WASHINGTON, Jan 22 (Reuters) - U.S. lawmakers struck a deal to reopen the federal government three days into a shutdown prompted by an impasse over immigration and border security, the Senate Democratic leader said on Monday.

"We will vote today to reopen the government," Minority Leader Chuck Schumer told the Senate. Schumer said Democrats would continue negotiating with Republicans on a bill to protect young immigrants from deportation.

(Additional reporting David Morgan, Ginger Gibson, Susan Heavey, Diane Bartz, Megan Davies, Lucia Mutikani, Yasmeen Abdutaleb; Writing by Doina Chiacu; Editing by Alistair Bell)