Trouble may be on the horizon for Democrats with their oft-loyal union followers after President Obama's decision to reject construction of the Keystone XL oil pipeline.

The Laborers’ International Union of North America (LIUNA) is up in arms following Obama's announcement Friday, saying he threw hard-working blue-collar Americans "Under the bus."

"We are dismayed and disgusted that the President has once again thrown the members of LIUNA, and other hard-working, blue-collar workers under the bus of his vaunted ‘legacy,’ while doing little or nothing to make a real difference in global climate change,” Terry O’Sullivan, the union’s general president, said in a statement. “His actions are shameful."

The group’s statement cited a State Department report that Keystone could reduce greenhouse gas emissions when compared with oil transportation by rail.

“But facts apparently mean as little to the president as the construction jobs he repeatedly derided as insignificant because they are ‘temporary,’ ” O’Sullivan said. “Ironically, the very temporary nature of the president’s own job seems to be fueling a legacy of doing permanent harm to middle- and working class families.”

During Friday's speech, Obama rejected claims that the Keystone pipeline would have generated real employment opportunities, even though a 2014 State Department report documented that the project would have brought over 42,000 new jobs to the market.

Looks like the bloom may be off the rose for at least one union. Perhaps others will wake up and follow suit.

(h/t: The Hill)