Is it true that no immigrant from any of the seven countries Trump named in his executive order has been guilty of terrorism on US soil?
Donald Trump only named one country in his executive order: Syria. The seven countries (including Syria) were originally named by the Obama administration. So the claim is false on its face, as it misrepresents the executive order. But that's arguably a technicality. There have been two Somali refugees recently (in the last year) who died while committing acts of mass murder.
Daesh claims that the Minnesota mall attack was a terrorist action. From CNN:
The man who stabbed nine people at a Minnesota mall Saturday before being shot dead by an off-duty police officer was a "soldier of the Islamic state," according to an ISIS-linked news agency.
The statement posted online Sunday by the Amaq agency follows a pattern of ISIS-related media claiming responsibility for what appear to be the acts of individuals across Europe in the past few months.
CNN cannot independently confirm this latest claim.
Even if not terrorism, it was certainly a mass homicide by a Somali refugee. From The Hill:
His father told the Star Tribune that Adan was born in Kenya but grew up in the U.S. Ahmed Adan, who is Somali, said his son came to the U.S. 15 years ago, according to the Associated Press.
So he was born to Somali refugees in Kenya and grew up in the United States. Perhaps that might not technically refute the claim, but it is quite close.
And of course, the 2016 Ohio State University attack was committed by another Somali refugee. From CNN:
In a Facebook post shortly before the Monday morning rampage, the Somali immigrant urged America "to stop interfering with other countries, especially the Muslim Ummah," a term for Muslim people at large.