Trump was dismissive of Obama's speech.
Trump defeated Hillary Clinton in all of the four states in 2016, winning Wisconsin and Pennsylvania by less than 1 percentage point. Flipping any of these states would boost Biden's chance of winning the tight election race.
Trump, on his first trip outside Washington, in weeks, had on Tuesday defended the timing of the move, saying the US could not be "closed for the next five years".
Trump had recently called Iran a "rogue" state, which has aroused fierce response from the Iranian government. Iranian President Hassan Rouhani said on Wednesday at the UN General Assembly that Trump's recent anti-Iran speech was "ignorant and spiteful."
Trump also spoke by phone with Japanese Prime Minister Shinzo Abe on Monday about the peninsula situation.
Trump's remarks came a day after Senator Lindsey Graham, a Trump ally, introduced a resolution condemning the impeachment inquiry, in which he called the current proceedings "illegitimate and dangerous," and urged the House to vote to initiate a formal impeachment inquiry, provide Trump with "due process," and allow Republicans to fully participate.
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Trump said on Aug 20 that he would "most likely" meet with top DPRK leader Kim Jong-un for a second time, and he believed Pyongyang had taken specific steps toward denuclearization.
Trial of DC/EP in Shenzhen shows tech innovation could strengthen monetary system
Trump campaigned on a promise to appoint judges who would overturn Roe. His first two appointments to the high court — Neil Gorsuch and Brett Kavanaugh — were also conservative Catholics presumed to be in favor of reversing Roe.
Tsinghua researchers have been talking about the future of AI since 2014 and expect it to enter the third stage of its development in coming years, said Zhang.