WASHINGTON — President Donald Trump is escalating threats to crack down on what he describes as the “radical left” following Charlie Kirk’s assassination, stirring fears that his administration is trying to harness outrage over the killing to suppress political opposition.

Without establishing any link to last week’s shooting, the Republican president and members of his administration have discussed classifying some groups as domestic terrorists, ordering racketeering investigations and revoking tax-exempt status for progressive nonprofits. The White House pointed to Indivisible, a progressive activist network, and the Open Society Foundations, founded by George Soros, as potential subjects of scrutiny.

Although administration officials insist that their focus is preventing violence, cri

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