Several of President-elect Donald Trump’s picks for high-profile roles in his administration have walked back their earlier stances on foreign intelligence gathering, vaccinations and women serving in combat roles as they prepare for confirmation hearings this week.

The U.S. Senate will get down to the business of confirming President-elect Donald Trump’s Cabinet picks this week, when several nominees will face an uphill battle as they work to convince a majority of lawmakers that they are fit to serve in the position to which they’ve been nominated.