The Senate on Thursday advanced Defense Secretary nominee Pete Hegseth in a vote that was mostly along party lines, presenting Republicans with a major test of unity just days into President Donald Trump’s second term.

The Republican-led chamber, requiring only a simple majority, voted 51-49 to clear a procedural step and set the stage for confirmation likely over the weekend. Sens. Lisa Murkowski (R-AK) and Susan Collins (R-ME), both centrists, were the lone Republicans to oppose Hegseth.