NEW YORK — A hotel maid’s sexual assault lawsuit against Dominique Strauss-Kahn can go forward to trial, a judge ruled this morning, rebuffing the former International Monetary Fund leader’s diplomatic-immunity claim.

Bronx state Supreme Court Justice Douglas McKeon’s ruling kept alive the civil case that emerged from a May 2011 hotel-room encounter that also spurred now-dismissed criminal charges against Strauss-Kahn, then a French presidential hopeful. The episode was the first in a series of allegations about his sexual conduct that sank his political career.

The housekeeper, Nafissatou Diallo, 33, said Strauss-Kahn, 63, tried to rape her when she arrived to clean his Manhattan hotel suite. Strauss-Kahn has denied doing anything violent during the encounter.

Prosecutors dropped related criminal charges last summer, saying they had developed doubts about her trustworthiness because she had lied about her background and her actions right after the alleged attack. She has insisted she told the truth about what happened in the encounter itself.