She'd last been seen on May 10, when she appeared alongside President Trump as he welcomed three American detainees released by North Korean leader Kim Jong Un.
U.S. First lady Melania Trump isn't joining her husband at the G7 summit in Quebec this week or planning to accompany him to the expected meeting with North Korea's leader in Singapore the week after, spokeswoman Stephanie Grisham said Sunday. "Thank you to the Gold Star families that joined us in celebration & remembrance", the tweet said. She had not been seen publicly since undergoing a medical procedure in mid-May.
"BUT BUT: The event is closed to the press, so Monday evening may not resolve the mystery", Stelter tweeted.
The last time Melania Trump participated in an official event was on 10 May, when the first couple greeted three former USA prisoners who had been released from captivity in North Korea.
"I wish that I didn't suspect that the prolonged, poorly explained public absence of Melania Trump could be about concealing abuse", Smith tweeted.
Wild theories began to circulate online, including that Mrs Trump had moved back to NY with their son, Barron, or that she was co-operating with special counsel Robert Mueller.
During a segment on CNN the same day, the host and guests claimed the First Lady is "missing", despite journalists saying they've seen her in recent days. But, in a twist worthy of Poe or Coleridge, when said reporters turned to the window to look for Melania Trump, she was nowhere to be found.
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Concern has been growing for US President Donald Trump's wife as her absence from public appearances became very noticeable.
"Isn't that right, honey?" he asked as Melania Trump laughed from the front row.
Gold Star Families for Peace is an organization that provides support for fellow members who have lost family members in the Iraq War.
She is known for her privacy and White House independence, often breaking with her husband's schedule.
According to CNN, the president's "awkward" speech included theories that the First Lady had fled to NY with 12-year-old son Barron, or was recovering from plastic surgery.
Until Monday, the first lady had been out of the public eye for 25 consecutive days.
Some said Melania had moved back to NY or was cooperating with special counsel Robert Mueller, head of the main investigation into alleged Russian election meddling that President Trump has branded a "witch hunt".