New Delhi, July 31 -- President Donald Trump and Ukrainian President Volodymyr Zelenskyy will meet Tuesday ahead of Sen. Lindsey Graham's funeral, their second sit-down this month and after a far-right activist with the U.S. president's ear had a widely publicized change of heart on Russia's war against Ukraine.

Trump is set to welcome Zelenskyy to the White House as the Ukrainian leader travels to Washington to honor Graham, whose final act as a public official was visiting Kyiv and securing an agreement on a package of sanctions that seek to punish countries that purchase Russian oil, gas and other exports.

But Zelenskyy is now being bolstered by an unusual source: Laura Loomer, known primarily for her incendiary social media posts an...