World leaders braced for contentious talks Friday with President Donald Trump at the G-7 summit after he earlier lambasted allies at NATO.
Police said heavily armed officers on trains - a first in Britain - was part of heightened security nationwide after the Manchester bomb attack.
Balkan websites ran headlines such as "America First" and "Where do you think you are going?" but Montenegro's prime minister wasn't too upset.
Gianforte, 55, a technology entrepreneur, triumphed a day after being charged with misdemeanor assault of a reporter for The Guardian newspaper.
A possible shove of Montenegro's prime minister and a pair of awkward handshakes with French President Macron kept the internet buzzing Thursday.