It’s Ms. Sun goes to Washington. The alleged Chinese spy who infiltrated the New York governor’s office was able to get into the White House — while under federal investigation, The Post has learned. Linda Sun’s tour of the Executive Mansion came just two months before the FBI raided her gaudy $3.5 million Long Island home as they wrapped up their case into her alleged work for Beijing. The May visit was facilitated by Sun’s former boss Queens Rep. Grace Meng (D-NY), the congresswoman’s office confirmed Friday. Sun — a former high-ranking aide for Gov. Kathy Hochul and former Gov....