Richard Ratcliffe
"No child should have to go this long without their mother" the Foreign Secretary said after the meeting.
May shared her "serious concerns" with Iranian president Hassan Rouhani at the UN.
PM to raise ‘serious concerns’ about the detention of jailed charity worker when meeting Hassan Rouhani in New York.
Her husband branded the three day release a "cruel game".
The news comes after the British mother was returned to jail following a temporary three-day release.
Jeremy Hunt Praised By Nazanin Zaghari-Ratcliffe's Husband For Efforts To Release Briton From Prison
Richard Ratcliffe says the foreign secretary has given greater priority to his wife's case than his predecessor Boris Johnson.
She has returned to prison.
'That big smiling face. I couldn’t believe it.'
The British mum has been held in Iran since April 2016.
'I can’t believe it – what is going on in that country?'