Former Democratic presidential nominee Hillary ClintonHillary Rodham ClintonHillary Clinton 'outraged' by Manchester attack Oklahoma rep. launches long-shot bid for Oversight chair Europeans are terrified by America's family feud MORE tore into President Trump on LGBT rights on Thursday, saying Americans will have to "make it clear where our country stands" in the 2018 midterm elections.

"I think we have to face the fact that we may not ever be able to count on this administration to lead on LGBT issues," Clinton said during a speech at The Center, an LGBT support organization, where she was receiving an award. 

In her address, she warned that certain LGBT protections and rights gained under the Obama administration may be at risk of falling by the wayside under Trump's leadership. 

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"We've learned something important," she said. "That the progress that we fought for, that many of you were on the front lines of and that we celebrated and maybe even taken for granted, may not be as secure as we once expected."

She hammered the Trump administration's decision to roll back federal guidelines instructing schools to allow transgender students to use the bathroom of their choice, saying her "heart broke" from the move and urged supporters to look ahead to the 2018 midterm elections to "make it clear where our country stands" on LGBT.

Clinton has become increasingly vocal in her post-election criticisms of Trump, regularly going after the president at public events. The appearances come after a period of relative silence for the former secretary of State, who fought Trump in a bitter and controversy-ridden presidential election last fall.