Senate Armed Services Committee Chairman John McCain responds to questions from reporters after voting on the 2016 National Defense Authorization Act in the U.S. Capitol in Washington, D.C. on Nov. 10, 2015. (Shawn Thew/EPA)

As the last Republican presidential nominee, Mitt Romney, unloaded on current GOP presidential front-runner Donald Trump on Thursday, another former GOP nominee, Sen. John McCain of Arizona, joined in the critique.

McCain said in a statement Thursday that he “share[s] the concerns” Romney set out in a speech in Utah, where he described Trump as a “phony” and a “fraud.”

McCain, who lost the 2008 presidential race to Barack Obama, said he “would also echo the many concerns about Mr. Trump’s uninformed and indeed dangerous statements on national security issues that have been raised by 65 Republican defense and foreign policy leaders” in a letter publicized Wednesday.

That letter described Trump’s foreign policy views as being “wildly inconsistent and unmoored in principle.”

“At a time when our world has never been more complex or more in danger, as we watch the threatening actions of a neo-imperial Russia, an assertive China, an expansionist Iran, an insane North Korean ruler, and terrorist movements that are metastasizing across the Middle East and Africa, I want Republican voters to pay close attention to what our party’s most respected and knowledgeable leaders and national security experts are saying about Mr. Trump, and to think long and hard about who they want to be our next Commander-in-Chief and leader of the free world,” McCain said.

But McCain stopped well short of saying he would not support Trump should he in fact become the Republican presidential nominee.

As recently as Monday, McCain told reporters, “I’ve always said I support the nominee.”

“And if that’s Donald Trump?” a reporter asked in a Senate hallway.

Replied McCain: “Hello? I said: I. Support. The. Nominee.”