Fake news.
The policy was brought in by Republicans during Obamas rule, who of course did nothing. The media decided to focus on it when the IG report came out showing corruption in the FBI and DOJ.
Looks like your hero Merkel could be gone soon.
http://www.breitbart.com/london/2018/06/16/longstanding-disagreements-on-migrant-policy-threaten-to-end-merkel-era/