Indeed, that's what the Nazis said about the Polish Jews fleeing pogroms from the east. Goebbels wanted to build a wall.
You can't make-up this stuff.
BS. Goebbels was in charge of propaganda, his job to make Germany look good. He never suggested building a wall, Commandant Ludwig Fischer ordered the construction of the walls surrounding the Warsaw Ghetto, in turn per example used by other Nazi regional commanders to do the same with local Ghettos.
Very few Polish Jews fled east, rather they fled north, west and south, many to Holland, France, Britain, later the US, some to South and Central America, some to Scandinavia, others to North Africa including Israel. 6k Polish Jews made it to Curacao, home of the oldest synagogue in the Americas. From there, departed to Brazil, Argentina, Mexico which all had previously established thriving Jewish communities. Mexico City, the City of Churches, had more than 20 synagogues established earlier by Sephardic, Polish and German Jews. Many Polish people, including Jews, migrated to Mexico when the Mexican government offered migrants $500 and 500 hectares of land for European migrants to the sparsely populated rural areas. The same for Catholic Germans and German Jews.
Carlos Slim Helú, the world's wealthiest man, is partly descended from itinerant Polish Jewish Klezmer musicians who migrated to Mexico during the 1850's. The use of the accordion in Mexican music, with its many waltzes, is a legacy from both Polish and German immigrants of all faiths.
You did make that stuff up.