The judgment in the case of alleged Russian spy Katia Zatuliveter is expected at the end of next month, Justice John Mitting, who chairs the Special Immigration Appeals Commission, said in London on Friday.
Zatuliveter, 26, an aide to British Liberal Democrat MP Mike Hancock who sits on the Defense Select Committee, is accused of passing information to Russian intelligence services.
She earlier admitted to having a four-year affair with Hancock, who is married, but denies being a spy.
Zatuliveter was arrested in December and was then ordered to leave the country.
Earlier in October she began her appeal against the Home Office deportation order.
“I’m innocent. I don’t think I should be deported when I haven’t done anything. I don’t understand why I should be deported because someone made a mistake,” she said in her testimony to the Special Immigration Appeals Commission hearing, as part of her bid to stay in the country.