Arwa Mahdawi's Guardian column argues that Stephen Miller, Donald Trump's new White House chief of staff replacing Susie Wiles, is the real "shadow president" – a competent, calculating ideologue who has played Trump like a fiddle, architect of family separation and co-founder of America First Legal. She warns he will do a lot of damage, while David Smith calls the appointment a "middle finger to millions of American voters" and Republicans Against Trump say Trump hasn't learned from the midterm wipeout.