Merkel caucus: Could accept Brexit delay until end of June but not beyond

A one time delay?

• The CDU/CSU caucus makes a statement
• Ready to discuss proposals on Brexit
• Could accept a Brexit delay until the end of June
• A delay beyond June would be impossible

Previously they've said they need a reason for a delay. I don't really see a reason for this one so I find it hard to take their June deadline seriously.