Trump last spoke at Gettysburg in October 2016, weeks prior to the 2016 general election.
Trump has said he had the right to fire Yovanovitch, which he did in May 2019.
Trump's campaign has filed a barrage of lawsuits in various states. Election officials have said there is no evidence that the vote was rigged.
Trump said the bulk of the convention would be virtual and include live speeches from different locations, including his address on Aug 27.
Trump has argued that Obama, a Democrat, negotiated a bad deal for the US in agreeing to the nuclear accord.
Trump, known for personal attacks on critics and political adversaries, made his comments a week after agreeing to end a 35-day partial government shutdown without getting the .7 billion he had demanded from Congress to help build the wall. His retreat was seen as a political victory for Pelosi, who became speaker last month when Democrats took over control of the House from the Republicans.
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Treasury later this year is expected to exhaust its statutory borrowing authority amid heavy deficit spending by the federal government.
Trump signed an order in January to keep the detention center open and hinted in his State of the Union address to Congress this year that Islamic State or al Qaeda fighters could be added to the prison population.
Trip.com has been granted a third-party payment license from the People's Bank of China, the country's largest online travel agency said in an announcement on Sunday.
Trump presses on with uphill legal fight - World - Chinadaily.com.cn