A member of the second U.S. congressional delegation to visit Taiwan this month said Friday that the self-ruled island is “on the rise,” as Beijing demanded the group “call off” their trip.

“I’m midway through my visit to Taiwan & this much is clear: this place is on the rise,” Rep. Elissa Slotkin, a Democrat from Michigan and a former U.S. intelligence official said on Twitter.

“The fortitude & determination of the people, led by their dynamic (frankly, kick-ass) President, is downright inspiring — and I don’t inspire easily. Democratic values still & always matter,” she added.

Slotkin and four other members of the U.S. House of Representatives arrived in Taiwan for a brief visit on Thursday at a time when Beijing has ramped up political and military pressure on the democratically governed island, including through a show of force over Taiwan’s air defense zone.

The Chinese Communist Party (CCP) claims the self-ruled island of Taiwan as a province of China. Taiwan has its own ruling party, constitution, and military. In a speech in October, Chinese leader Xi Jinping said he would achieve “reunification of the nation,” and called Taiwan’s independence a “serious hidden danger to national rejuvenation.”

Other members of the delegation are Democrats Mark Takano, chairman of the House Committee on Veterans’ Affairs, Colin Allred, Sara Jacobs, and Republican Nancy Mace, the de facto U.S. embassy in Taiwan said, noting that the lawmakers are due to leave the island on Friday.

“The congressional delegation will meet with senior Taiwan leaders to discuss U.S.-Taiwan relations, regional security, and other significant issues of mutual interest,” the Taipei branch of the American Institute in Taiwan said in a statement.

Shortly after arriving in Taiwan on Thursday, Slotkin said that her office received a message from the Chinese Embassy telling her to abandon the trip.