August 18, 2017 12:30 PM EDT

Former Republican presidential nominee Mitt Romney has denounced President Donald Trump for his delay in condemning racism following the violence at white nationalists rallies in Charlottesville, Virginia, over the weekend.

In a passionate letter, which he posted on Facebook Friday morning, the former Massachusetts governor said it was a “defining moment” for Trump’s presidency and urged the President to “act now for the good of the country.” Read Romney’s post in full below:

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