berlin german chancellor angela merkel speak spanish prime minister mariano rajoy saturday discuss catalan crisis stress support unity spain encourage dialogue spokesman say monday merkel also discuss catalan situation european commission president jean-claude juncker saturday speak current situation spain talk prime minister rajoy particular affirm support unity spain german government spokesman tell regular news conference merkel also discuss ways strengthen internal dialogue within spain far constitution allow say concern mount europe possible declaration independence catalan regional parliament reaction spanish government could exacerbate already spain bad political crisis decades merkel host european council president donald tusk informal talk berlin wednesday spokesman say decline speculate whether would discuss catalan crisis merkel tell rajoy support unity spain