President Donald Trump's personal Twitter account published some threatening and critical tweets Tuesday night, most notably a warning that he would "send in the feds" unless Chicago "fixes its carnage."

In the span of about 20 minutes, the account tweeted messages praising Fox News while criticizing CNN, threatening to "send in the feds" to Chicago in response to the city's crime problem, and touting Trump's plans for national security.

The tweets about Chicago followed comments from the city's mayor, Rahm Emanuel, who said Monday that Trump should get over his fixation with the size of the audience that witnessed his inauguration.

It was not immediately clear what Trump meant when musing about sending in "the feds." He has previously urged Emanuel to seek US help if the city fails to reduce its homicide rate. January could become a record-setting month for shootings and homicides in the city.

Chicago Police Superintendent Eddie Johnson issued this response to Trump's tweet Tuesday night: "As the Mayor said just a few hours ago, the Chicago Police Department is more than willing to work with the federal government to build on our relationships with DOJ, FBI, DEA and ATF and boost federal prosecution rates for gun crimes in Chicago."

Trump's social-media messages came after two days of pronouncements and executive actions from the Trump administration — some of which have been controversial on different fronts.

During his first two weekdays in office, Trump:

Trump's press secretary, Sean Spicer, on Tuesday also reiterated the president's claims of voter fraud in the November 8 election, assertions that have never been supported by evidence.

The White House on Tuesday again declined to offer evidence to back up Trump's repeated voter-fraud claims, prompting an impassioned rebuke from CNN anchor Jake Tapper on Tuesday.