BERLIN — German conservatives are preparing to confront European Commission President Ursula von der Leyen with a stark ultimatum: Rein in Brussels control and red tape or face a new push to curb the Commission’s powers. Von der Leyen is set to attend a gathering of German Chancellor Friedrich Merz’s conservatives in Berlin on Monday, where the group plans to face her with tougher demands on fast-tracking cuts to what they see as burdensome EU regulations weighing on German businesses, two of