The East of England Ambulance Trust has failed part of their latest Care Quality Commission inspection.
Now MPs say the trust now have a week to come up with an action plan to improve ambulance response times.
Suffolk Coastal MP Therese Coffey says the Chair of the Trust Maria Ball must consider her position.
More top news
The major party leaders' campaigns for the General Election will remain suspended on Wednesday following the Manchester terror attack.
Counter-terror police have arrested a man at Stansted Airport on suspicion he planned on travelling to Syria.
Dry with periods of strong sunshine. Becoming very warm for many places but a little cooler on the coast with onshore breezes.