Senator’s former press aide named senior White House adviser.

For congressional reporters of even a moderately long vintage, Stephen Miller was known as an eager press aide to Senator Jeff Sessions of Alabama, eager to talk ... and talk ... and talk about policy, especially his views on immigration.

Mr. Miller hit it big when he left the Senate for the Trump campaign when few gave Mr. Trump much of a shot to win the Republican nomination.

On Tuesday, he was named assistant to the president and senior adviser to the president for policy.

“Stephen played a central and wide-ranging role in our primary and general election campaign,” Mr. Trump said. “He is deeply committed to the America First agenda, and understands the policies and actions necessary to put that agenda into effect. He is a strong advocate for protecting American workers, and will fulfill a crucial role in my Administration as my senior adviser on matters of policy.”

Get ready for election 2020.

Before Mr. Trump is even inaugurated, the first poll of his potential Democratic opponents in 2020 is now out. Not surprisingly, it looks a bit premature.

“Joe Biden leads the way for Democrats with 31% to 24% for Bernie Sanders, and 16% for Elizabeth Warren. They’re the only folks we tested with meaningful support for the nomination at this point.”

The survey of 400 Democratic primary voters, conducted last week by Public Policy Polling, drops off precipitously from there, with Senator Cory Booker of New Jersey coming in at 4 percent, Senators Al Franken of Minnesota and Kirsten Gillibrand of New York at 3 percent, Senator Sherrod Brown of Ohio and Gov. Andrew Cuomo of New York at 2 percent, and Julián Castro, President Obama’s housing secretary, at less than 1 percent.