If they are law abiding citizens in their country then why shouldn't they be allowed in America. Besides Trump already likes Polish people anyway because of their stance on nationalism and their vocal view against the EU. Maybe just immigration but not agreeing with any idea that the EU has then they would be against you. Polish seem to me to be hard-working and hardly commit crime. Basically if they are law abiding and filled the necessary requirements for a visa then they should be allowed into the Country for 90 days.