WASHINGTON — House Republicans unveiled a spending bill Saturday that would keep federal agencies funded through Sept. 30, pushing ahead with a go-it-alone strategy that seems certain to spark a major confrontation with Democrats over the contours of government spending.

The stopgap measure would keep the government funded through Sept. 30. But Democratic leaders are opposed, and it’s unclear if Johnson can pass it with only Republicans.

Republicans in control of the U.S. House of Representatives unveiled their six-month stopgap government funding bill on Saturday to avoid a potential government shutdown on March 14. The proposal would fund the government through September,