The Leicester MP Liz Kendall says she is angry at the government's failure to release key data on death rates at Children's Heart hospitals.
Glenfield is one of those units due to close as part of moves to have fewer Children's heart centres in England.
She wants the data to be passed to leading expert professor Sir Brian Jarman who is looking into how the decision was reached.
Campaigners fighting to keep children's heart surgery at Glenfield hospital in Leicester are celebrating a High Court ruling.
A House of Commons debate will take place today (22 October) to discuss the closure of Glenfield's children's heart surgery.
The Secretary of State for Health, Jeremy Hunt, has asked for an initial review of plans to relocate the Glenfield Heart Unit.