Dimona nuke reactor employees having trouble getting US visas?

Israel's Dimona nuclear reactor's employees have told Israel's Maariv daily that they have been having problems recently getting visas to the United States where they have for years attended seminars in Chemistry, Physics and Nuclear Engineering (link in Hebrew, Hat Tip: BA Wilson). They also complain of being treated in an 'insulting manner' by President Obama's people. Until recently, employees