Ocasio-Cortez was responding to a meme the President's son had posted that dismissed her and insinuated that socialists eat dogs.
Several conservative pundits quickly cried foul at Ocasio-Cortez's tweet, saying she was threatening to subpoena a citizen for criticizing her.
"Did you just threaten to subpoena someone for criticizing you?" Kimberly Guilfoyle, Trump Jr.'s girlfriend and vice chairwoman of the pro-Trump political action committee America First Policies, tweeted
. "As a lawyer and former prosecutor I find this deeply troubling."
Sean Davis, co-founder of conservative magazine The Federalist, tweeted
, "It's worth noting that the official House Ethics Manual explicitly prohibits the kind of threat that @Ocasio2018 just issued against @DonaldJTrumpJr for his refusal to support her political agenda."
Ocasio-Cortez later tried to clarify her remarks, arguing that she did not have subpoena power as an individual freshman member.
"For the GOP crying that this is a 'threat' - I don't have power to subpoena anybody," she tweeted
later Friday. "Congress as a body, GOP included, has the power. No indiv. member can issue a subpoena unless they are a Chair (which, as a freshman, I can assure you I will not be). Also must be under purview."
Democrats have been openly planning to use their incoming majority to launch several investigations
into an array of the Trump administration's affairs, including Cabinet members' behavior, policy decisions and the President's long-sought tax returns.
But during a news conference
a day after the November election, the President threatened that if the Democrats investigated him, he would have the Republican-led Senate investigate them. "I think I'm better at that game than they are," he said.
This story has been updated.