UPDATE (2:28 p.m.): Principal Deputy Press Secretary Sarah Huckabee Sanders will be the new press secretary.
UPDATE (2:03 p.m.): On Twitter, Spicer says he's going to remain as press secretary through August. He said it has been an "honor and a privilege" to serve President Trump and the United States.
UPDATE (1:59 p.m.): Sean Spicer will appear on Hannity tonight with Reince Priebus and Anthony Scaramucci. Earlier, he told Dana Bash that he hoped to give President Trump a "clean slate."
Sean Spicer to @DanaBashCNN: "I wanted to give the president and the new team a clean slate"— Oliver Darcy (@oliverdarcy) July 21, 2017
UPDATE (12:45 p.m.): Despite reports to the contrary, Priebus told the Associated Press that he supports Scaramucci in his new role and that the two are "good friends."
WH chief of staff Reince Priebus says he supports new comm. director Anthony Scaramucci "100 percent." https://t.co/U9b9ycfMRb— AP Politics (@AP_Politics) July 21, 2017
UPDATE (12:21 p.m.): More details are beginning to emerge about the lead-up Spicer's sudden resignation. Per NBC's Katy Tur, on Thursday night Spicer was telling people that he would resign if Scaramucci was hired in the communications role. Further, White House Chief of Staff Reince Priebus is also reportedly very opposed to Scaramucci.
Spicer was telling folks last night he would resign if Scaramucci was hired. Said he didn't think Scaramucci could do the job. -source close— Katy Tur (@KatyTurNBC) July 21, 2017
Reince Priebus furious, per multiple who spoke w him. He has tried blocking Scaramucci at various points.— Maggie Haberman (@maggieNYT) July 21, 2017
Spicer's once-prominent public role at the White House had effectively diminished to next to nothing in the past few weeks. The majority of the press briefings are now off-camera, and Principal Deputy White House Press Secretary Sarah Sanders has been running the briefings, not Spicer.
UPDATE: The Associated Press is also reporting that Spicer has resigned over Scaramucci's appointment.
White House press secretary Sean Spicer is resigning, apparently over objections to new communications director. https://t.co/KLZQ1c0hFf— The Associated Press (@AP) July 21, 2017
White House Press Secretary Sean Spicer has reportedly resigned, per the NYT's Glenn Thrush. Spicer was opposed to the appointment of Anthony Scaramucci as the White House Communications director.
.@PressSec resigned after vehemently objecting to appointment at 10 a.m. Friday of Anthony Scaramucci as WH Communications director, per SAO— Glenn Thrush (@GlennThrush) July 21, 2017
This post has been updated.