Former New Jersey Gov. Chris Christie joined at least two other fellow Republican presidential candidates in attacking Vivek Ramaswamy's foreign policy expertise this week.

During a Fox News appearance on Tuesday, Christie attacked Ramaswamy's previous comments on the United States defending Taiwan until 2028, which he later amended and said he would defend the nation until the U.S. achieved semiconductor independence and then should reevaluate moving forward, a break with Republican ideology.

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"When it comes to Taiwan, the foreign policy starts in Ukraine, where we send a very clear message through our unlimited support of the Ukrainian efforts to defeat the Russians and send a clear message to China that we are not going to cut and run," Christie told Fox News. "We're not going to do what Joe Biden did in Afghanistan. We're not going to abandon our friends and leave them on the battlefield. That's going to send a very clear message to China, that if they tried to make any aggressive moves towards Taiwan, the juice will not be worth the squeeze for them in a Christie administration."

Ramaswamy has also said he would end the U.S. policy of "strategic ambiguity" when it comes to Taiwan and that he is not in favor of putting American lives at risk to defend the island, which Christie slammed during his interview.

"There's nothing ambiguous about Vivek's position on this. He is going to give Taiwan to the Chinese in 2028," Christie continued. "So he's right. He's getting rid of ambiguity, but his ambiguity is to give Taiwan away to the Chinese. That's not what I want to do. That's not what I think is right for America or for the rest of the world."

Christie again shared the clip of him rebutting Ramaswamy on Wednesday, in which he directly called out his rival. "Let’s be clear: @VivekGRamaswamy’s foreign policy is to run and hide. He would give Taiwan to China. In a Christie administration, we will not cut and run. We don’t abandon our allies," he wrote.

Christie joins former Vice President Mike Pence and former United Nations Ambassador Nikki Haley, who have both slammed Ramaswamy this week.

Pence shared his "Day One Executive Action" plan, a part of which includes rebuilding America's global military strength, during a call with reporters on Tuesday. As he shared his plan, Pence also took aim at Ramaswamy, linking him to former President Barack Obama. “I believe that Vivek’s foreign policy echoes the Obama doctrine of appeasement to the world's most ruthless regimes of Russia and China and Iran,” Pence said on the call.

On Tuesday, Haley called out Ramaswamy for previously stating he would halt funding for Israel, a key American ally in the Middle East after a $38 billion U.S. package ends in 2028. It's a stance that puts him at odds with most Capitol Hill lawmakers.

".@VivekGRamaswamy’s attacks & desperate attempts at damage control don’t change how he treats our friend Israel & how his dangerous policies make America less safe. Israel faces genocidal threats from Hamas, Hezbollah, Iran, & Syria," she posted. "Our next president must understand that. Vivek said we should abandon Israel after 2028. Those are HIS words."

Ramaswamy has risen to third place in some of the national primary polls in recent weeks prompting more sharpened attacks from his 2024 rivals during last week's GOP primary debate. A RealClearPolitics poll average has Ramaswamy at 7.3% among Republican primary voters, behind former President Donald Trump, at 53.6%, and Gov. Ron DeSantis (R-FL), at 13.5%.

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The increased attacks against his fluctuating foreign policy stances have forced Ramaswamy to post a lengthy clarification explaining his ideology, and it indicates a possible weakness that more of his rivals may exploit at next month's second GOP primary debate. Haley, in particular, has made foreign policy a key component of her campaign and has repeatedly slammed Ramaswamy in recent weeks prompting him to launch a "truth over myth" website to combat the "lies" on Monday.

A political novice, Ramaswamy has risen above more experienced candidates in the presidential race but may need to offer up more substantive defenses regarding his foreign policy ideology as the heated attacks increase.