At the open, the OMXS index is down 1.6 percent, with most of the companies on the OMXS30 list in the red. The heaviest falls are seen in Sandvik and Boliden, which are down 3.7 and 3.4 percent respectively.
Volvo Cars, which reported new sales figures, fell 1.7 percent.
On Thursday night, Trump delivered an address to the nation in which he warned of significant attacks in the coming weeks. Oil prices have risen by about 6 percent to $107 a barrel.
The Swedish krona is also losing ground against the dollar, which now trades at 9.50 kronor.
