Do not risk your lives and your money. It is all for nothing.
Officials said Mr Tusk would be stressing in Athens and Ankara on Thursday that the goal was to eliminate entirely the transit of migrants from Turkey to Greece and that Europeans believed Turkey should be able to bring the numbers down to the "low triple digits" very soon.
While people seeking a better life are among the migrants building up in Greece, the majority of arrivals are refugees from war and persecution.
Athens has asked for around 480 million euros ($520 million) to help shelter 100,000 refugees.
The United Nations has warned that Europe is on the brink of a "self-induced humanitarian crisis" caused by the build-up of migrants and refugees on Greece's border with Macedonia.
Meanwhile NATO commander, US General Philip Breedlove, argues Russian Federation and Syria are deliberately trying to undermine security in Europe by aiding the flow of refugees. Tusk will head to Turkey later on Thursday to meet Prime Minister Ahmet Davutoglu, pressing Ankara to offer more "intensive" help in reducing the flow of migrants landing on Greek beaches. And Tusk called for greater support for Greece as it struggles with the continuing inflow of people from Turkey. Merkel has stood by her policy of accepting legitimate refugees, while much of the rest of Europe is increasingly resisting.
More than 25,000 are now stranded in northern Greece on the border with Macedonia, raising fears of a humanitarian crisis. Macedonian police fired tear gas to disperse hundreds of migrants who stormed the border from Greece on Monday.
But the apparent show of European solidarity masks growing criticism of countries that have capped the number of migrants they are willing to let in. Greek police quoted by AP said 130 people crossed the border from dawn to dusk on 3 March.
"Those who manage to arrive in Greece should not be allowed to continue on their journey", he said. One source told EUobserver that if it did, then Turkey would cancel arrangements to take back migrants from the EU.
"And I hope we can come to an agreement on resettlement: that, for a couple weeks, we can assess that the numbers coming from Turkey to Greece are really coming down, with the zero being visible, so that it is possible for the European Union to start a more ambitious resettlement programme".
Tusk's talks in Greece and Turkey were a prelude to a meeting in Brussels on Monday of European Union and Turkish leaders to address the crisis.
Macedonian authorities, who had been letting in small groups of migrants Thursday morning, closed the border again after the railway protest.
European Council President Donald Tusk is due to hold talks with Turkish President Recep Tayyip Erdogan to try to strengthen their joint approach to Europe's migration crisis.
The EU aid will pay for basic necessities such as food, shelter, clean water and healthcare until the end of 2018, with €300m available this year. "We must go here and wait", said Mouiiaed Saker, a Syrian.
Trump blames earpiece for not disavowing former KKK leader
When reporters in Texas asked him on February 26 about Duke's comments, Trump said, "I didn't know he endorsed me". Monday night, David Duke told WWL-TV over the phone there is a national media bias against Trump .