Attorney General Jeff Sessions in August. Photo: Chuck Burton / AP

The U.S. Justice Department has filed an antitrust challenge to Parker Hannifin's $4.4 billion purchase of Clarcor, which was completed back in February. At issue is DoJ's belief that the merger eliminated all competition in the market for airplane fuel filtration products. The Trump Administration isn't asking for the entire merger to be unwound, but does want the court to force Parker Hannifin to sell off either its own airplane filtration business or Clarcor's.

Why it matters: This is the first antitrust action brought by Trump's DoJ, although his FTC earlier sought to block the DraftKings-Fanduel merger (which was subsequently canceled).

Bottom line: The antitrust "waiting period" for this deal expired on Jan. 18, and Parker Hannifin formally closed the deal one month later. But DoJ now says that its lack of objection at the time wasn't reflective of de facto approval after review, but rather was the result of Parker Hannifin's failure to provide requested documents and data.

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Trump says he'll accept nomination at White House or Gettysburg

Trump at the 2016 Republican National Convention. Photo: Bill Clark/CQ Roll Call via Getty Images

President Trump tweeted Monday that he'll deliver his speech accepting the Republican nomination for president at either the Gettysburg battlefield in Pennsylvania or at the White House.

The state of play: Republican National Convention planners are looking for a new venue for the president to deliver his acceptance speech after convention events were canceled in Jacksonville, Fla., due to coronavirus concerns.

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Lebanon's prime minister resigns in wake of deadly explosion

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Lebanon's prime minister and cabinet have resigned amid massive protests in the aftermath of a deadly explosion in Beirut that killed more than 160 people, injured 6,000 and left roughly 250,000 homeless.

Why it matters: Protesters blame the incompetence of the ruling elite — widely viewed as corrupt — for the disaster. The unstable and deeply distrusted government will remain in place in a caretaker capacity until a new prime minister is selected.