Three of President Donald Trump’s cabinet picks prepared to face skepticism and intense grilling from Democratic senators Thursday.

Trump announced Stephen Miller as White House Deputy Chief of Staff for Policy, plus the additional role of homeland security adviser. Miller was a senior adviser to Trump during his first administration and one of the architects of some of his most controversial immigration policies, including his family separation program.

More of President Donald Trump's picks for his cabinet are expected to be confirmed by the U.S. Senate in the coming days after the Republican-controlled chamber began approving them last week. Hearings for other nominees are scheduled for this week as well,

Robert F. Kennedy Jr. is set to appear before the Senate’s finance committee, in the first of two days of hearings before senators vote on whether to confirm him as President Trump’s health secretary.

Historically, nominees for cabinet posts have been career politicians, bureaucrats, or academics with relevant experience or expertise. An example is former Boston Mayor Marty Walsh, a onetime construction worker and union boss who was nominated,