Sen. Bernie Sanders Bernard (Bernie) SandersPush to end U.S. support for Saudi war hits Senate setback Sanders: 'I fully expect' fair treatment by DNC in 2020 after 'not quite even handed' 2016 primary Sanders: 'Damn right' I'll make the large corporations pay 'fair share of taxes' MORE (I-Vt.) on Wednesday vowed to fight back against voter suppression after President Trump announced he would launch an investigation into voter fraud.

Sanders in a series of tweets said the president is telling Republicans to "accelerate voter suppression, to make it harder for the poor, young, elderly and people of color to vote."

"The great political crisis we face is not voter fraud, which barely exists. It's voter suppression and the denial of voting rights," he tweeted.

"Our job is to fight back, and do everything we can to protect American democracy from cowardly Republican governors and legislators."

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Trump on Wednesday said he would ask for a "major investigation into voter fraud" in the country.

"Depending on results, we will strengthen up voting procedures," he tweeted.