It's already been covered in this thread.
Obama changed the processing of visa applications from Iraq for 6 months, it added stricter processing which many said was an actual ban. He limited immigration to around 70,000 a year.
Trump stops this also, will lower it a little to 50,000 but what he's done is extend the ban to 6 other countries and also stopped legal immigration with the banning of people who have green cards and visas who have lived in America for years.
Trump also went against the advice of his National Security team and did an executive order demoting the influence of the Chairman of Joint Chiefs of Staff and other military advisers whilst bumping permantly on to the council the former editor of Breitbart Steve Bannon who is his chief adviser.
Bannon is a self confessed white nationalist and Russia supporter.
If you want a very conservative look at what Trump has done read this
http://www.nationalreview.com/artic...-order-no-muslim-ban-separating-fact-hysteria