Watch: Activists find the perfect way to shame Trump supporters at Montana rally
At a protest of Donald Trump in Great Falls, Montana, a woman holds a sign reading, 'I marched for civil rights, equal rights and to end the Vietnam War. Today, at 80, I march to save my country from Putin's corrupted whore!'

Critics of the White House united in song on Thursday as President Donald Trump traveled to Great Falls, Montana for a campaign rally.

The presidential visit was intended to boost the candidacy of Montana's Republican state auditor, Matt Rosendale, who is challenging Sen. Jon Tester (D-MT) in the 2018 midterm election.

As President Trump addressed his base inside the Four Seasons Arena, outside critics assailed the administration.

The "leader of the free world" shocked those watching streaming video by defending Russian Federation President Vladimir Putin, while outside, protesters united in song for a moving rendition of the Star Spangled Banner.

Watch protesters sing the national anthem at Trump supporters in Montana:

[caption id="attachment_1309450" align="aligncenter" width="615"] Merchandise table at Donald Trump rally in Great Falls Montana featuring T-shirts reading 'Make America Great Again 20/20' plus 'Keep America Great Again 2020' while a third features a silhouette of a AR-style assault rifle.[/caption]