Senior Houthi official in Yemen, Hazam al-Assad, has threatened U.S. President Donald Trump, who is expected to visit the Middle East next month. "Trump's visit to the region will not be safe as long as Gaza is not safe," he told the Hamas-affiliated A-Risalah network. "The continued shedding of Yemeni and Palestinian blood will cost Trump dearly if he lands in the region. The equation is clear – there will be no peace in the region as long as Gaza is not calm, and there will be no security in the Mediterranean and Red Seas as long as Gaza is not safe."