Speaker vote also a test for Trump
Trump appears to be working the phones ahead of the high-stakes vote.
In an interview with CNN, Trump confirmed he's been in touch with Republican holdouts.
ABC News previously reported Trump and his team were working to strike a deal with Rep. Chip Roy of Texas, an influential member of the House Freedom Caucus who remains undecided on Johnson.
"Chip Roy will do what's right for the country," Trump said during a phone interview with CNN.