Massachusetts Senator Elizabeth Warren may be staying quiet on the sidelines of the Democratic presidential nominating contest, but for some time now she has been loudly booing the opposition party's sideshow and the carnival barker at centerstage, Donald Trump.

In a series of tweets after Trump won Indiana on Tuesday to become the "presumptive" nominee of the Republican Party, Warren ripped Trump's campaign built on "racism, sexism, and xenophobia," vowing to do everything in her power to keep the controversial candidate from winning in November:

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"There's more enthusiasm for @realDonaldTrump among leaders of the KKK than leaders of the political party he now controls," Warren wrote on Twitter:

Warren went on to write that Trump "incites supporters to violence, praises Putin, and is 'Cool with being called an authoritarian:'"

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