But the European parliament has indicated it will move to block visa-free travel if it is not met.  The influx of asylum-seekers has largely abated since Turkey moved to close its borders.  But as recently as February Mr Erdogan reportedly threatened: “We can open the doors to Greece and Bulgaria any time and put the refugees on buses”.  One of his key advisers repeated the threat in a tweet late on Tuesday.  “The European Parliament will discuss the report that will open Europe visa-free for Turkish citizens. If the wrong decision is taken, we will send the refugees,” Burhan Kuzu tweeted.  There were reports in Germany this week that the EU is working on a “Plan B” in case the deal collapses.  Quoting an unnamed “EU minister”, Bild claimed there are contingency plans to confine asylum-seekers to the Greek islands if Turkey reopens its borders.  Ferry traffic to the Greek mainland would be suspended and asylum-seekers would be deported to their home countries directly from the islands.  The hardening of attitudes over the migrant deal is thought to be linked to the resignation of Ahmet Davutoglu as Turkish prime minister last week. Shortly after his departure, Mr Erdogan, the Turkish president, angrily rejected the EU demands for terror reforms: “We’ll go our way, you go yours.”  It was Mr Davutoglu who brokered the deal with Mrs Merkel, and his departure has left European governments without an obvious interlocutor in Ankara.  His resignation is believed to have been prompted by concerns over Mr Erdogan’s attempts to change the Turkish constitution to give himself more powers.  Despite cutting the influx of migrants, the deal has not been popular in EU countries.  In particular, Mrs Merkel’s decision to allow the prosecution of a German comedian for insulting Mr Erdogan has caused disquiet in Germany.  The controversy appears to have put paid to any hopes Mrs Merkel may have had that the migrant deal could arrest her decline in the polls.  Almost two-thirds of Germans do not want her to serve a fourth term as chancellor, according to a new poll released on Wednesday.  The poll by the Insa institute found 64 per cent of Germans do not want her to continue in office after next year’s general elections.
The controversial EU deal with Turkey over the migrant crisis appears to be in jeopardy, amid a worsening stand-off over Turkish anti-terrorism laws.