A New York judge says she's inclined to believe the U.S. government when it says a Vietnamese man plotted to carry out a suicide bombing of London's Heathrow Airport.

The statement Monday by U.S. District Judge Alison Nathan forced a postponement of the sentencing of Minh Quang Pham. The defense wants more time to try to change the judge's mind in hopes of lessening his prison term.

Pham pleaded guilty in January to terrorism charges and could face between 30 and 50 years in prison.

The charges are related to his support of al-Qaida in the Arabian Peninsula.

Pham did not agree during his plea to government claims he plotted in 2011 to carry out a Heathrow attack. No attack occurred.