A former Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE spokesman on Friday said Clinton warned the nation that President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE was not prepared to conduct international diplomacy.

Shortly after news emerged of Trump's controversial phone conversation with Taiwan's president, former Clinton campaign spokesman Brian Fallon tweeted: "If only someone had warned us Trump was not up to the task of international diplomacy."

If only someone had warned us Trump was not up to the task of international diplomacy. pic.twitter.com/jRsKT7VKq0 — Brian Fallon (@brianefallon) December 3, 2016

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The tweet including a video of Clinton from a June speech in which she warns that Trump is not prepared for “solving global crises.”

“Rather than solving global crises, he would create new ones. He has no sense of what it takes to deal with multiple countries with competing interests and reaching a solution that everyone can get behind,” Clinton said at the time.

“In fact, he is downright contemptuous of that work and that means he’s much more likely to end up leading us into conflict,” she added.

Trump spoke to Taiwan President Tsai Ing-wen on the phone Friday, breaking decades of U.S. protocol and risking a rift with China. The U.S. recognized China's claim on Taiwan in 1979, and as such has not had diplomatic relations with the island since. The arrangement is known as the "one China" policy.