"Michael Porter Jr. held a press conference today where he revealed he had asked out of the National Letter of Intent he’d signed with Washington and expects it to be granted soon. Porter Jr. says he has not met with new head coach Mike Hopkins, but expects he will before he’s released. Washington’s AD Jen Cohen has stated any signed recruit who meets Hopkins and no longer wants to come to UW will be granted a release from his letter."
http://www.rockmnation.com/2017/3/22/15029492/michael-porter-jr-nli-release-washington-missouri-tigers-basketball
and
"Because Porter Jr. signed a letter of intent, Washington needed to grant his release."
http://www.espn.com/recruiting/basketball/story/_/id/18978892/michael-porter-jr-gets-release-washington-huskies