House Republican leaders on Thursday postponed votes for a must-pass government funding bill and dismissed lawmakers to start a six-week recess, raising the risk of a government shutdown in September amid simmering internal conflicts over spending levels and hot-button social issues. The move to punt the bill—which would fund the Department of Agriculture and Food and Drug Administration—sets up a new round of budget fights in September when lawmakers return to Washington with only 12 work days in the House that month.