The controversial Somali-born Dutch MP Ayaan Hirsi Ali is under pressure to quit parliament amid revelations that she falsified her asylum application.
Ayaan Hirsi Ali: Hit by tough new stance on immigration
Dutch media say she will move to Washington to work for the conservative American Enterprise Institute.
A TV documentary about her, shown last week, triggered calls for her to be stripped of her Dutch passport.
Ms Hirsi Ali, a fierce critic of conservative Islam, is under 24-hour police protection.
She has received death threats since the murder of film-maker Theo van Gogh, who was stabbed by a radical Islamist, Mohammed Bouyeri, in November 2004.
She wrote the script for Van Gogh's TV film Submission, which angered many Muslims.
Ms Hirsi Ali did not deny that she had lied in her 1992 asylum application, her spokeswoman Ingrid Pouw told the BBC News website.
"Everybody knew she lied about her asylum," she said, explaining that Ms Hirsi Ali had changed her name and birth date in her application.
She had also concealed the fact that she had arrived from Kenya via Germany, Ms Pouw said.
"She told them she came from Somalia - that's why she got A status asylum in just five weeks," Ms Pouw said.
Radio Netherlands reports that Ms Hirsi Ali had revealed the truth about her background in interviews and again in 2003 when the liberal-conservative VVD party asked her to stand as a parliamentary candidate.
Ms Hirsi Ali will give a news conference at 1330 (1130 GMT) in The Hague on Tuesday, her spokeswoman said.
Dutch Immigration Minister Rita Verdonk initially announced that Ms Hirsi Ali would not be sanctioned over the asylum falsification.
But she later said that "based on this [TV] programme and the facts as they are known, the preliminary assumption must be that she is considered not to have obtained Dutch citizenship".
A local court has ruled that Ms Hirsi Ali must move house, after neighbours complained of a security risk.
Commentators say she will be well received in the United States, where Time magazine named her one of the most influential thinkers of our time, the BBC's Geraldine Coughlan reports from The Hague.