Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence 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.