Trumpies are following Priebus's statement that the seven coutnries singled out in Trump's travel ban were already chosen by Obama for travel ban as the most dangerous, that is not true, Read the real reason in aritcle by poloitofact, oit;s complex reason. Their conclusion:
"Priebus said Trump's executive order that temporarily bans nearly all travel to the United States from seven nations were "identified by the Obama administration as the seven most dangerous countries in the world in regard to harboring terrorists."
Prompted by concerns about terrorism, the Obama administration did put those seven countries -- Iraq, Syria, Iran, Sudan, Libya, Somalia and Yemen -- on a list that makes travel into the United States somewhat more difficult.
But that list doesn’t necessarily identify the seven as being the most dangerous.
For a statement is partially accurate but takes things out of context, our rating is Half True."
read the complex reason for the countries and Obanma's ban. see full politifact article: