Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) ripped 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 on Friday, warning that the president-elect is overhauling U.S. foreign policy without a strategy.

"What has happened in the last 48 hours is not a shift. These are major pivots in foreign policy w/out any plan. That's how wars start," Murphy, a member of the Foreign Relations Committee, said on Twitter.

Murphy added that if Trump isn't pivoting but just carrying out "radical temporary deviations," the real estate mogul could torpedo alliances.

(3) And if they aren't pivots - just radical temporary deviations - allies will walk if they have no clue what we stand for. Just as bad. — Chris Murphy (@ChrisMurphyCT) December 2, 2016

Murphy's tweet storm comes after The Financial Times reported that Trump spoke with Tsai Ying-wen, the president of Taiwan.

The move could roil the U.S.-Chinese relationship, as Washington has recognized Beijing as the sole government of China for decades. The U.S. ended official diplomatic ties with Taiwan under President Jimmy Carter.

The Trump transition team said Friday the two spoke about the "close economic, political, and security ties exists between Taiwan and the United States."

Financial Times noted the phone call is the first between a leader of Taiwan and a U.S. president or president-elect since 1979.

Murphy added that while Trump "right to shift policy, alliances, strategy" that it's time for the president-elect to name an experienced secretary of State.

(4) It's probably time we get a Secretary of State nominee on board. Preferably w experience. Like, really really soon. — Chris Murphy (@ChrisMurphyCT) December 2, 2016

That sentiment was echoed by Sen. Brian Schatz, a Democrat from Hawaii.

1 - The world needs clarity on this Taiwan phone call. 2 - We really need a steady hand at State Department. Tomorrow would be perfect. — Brian Schatz (@brianschatz) December 2, 2016

A senior Russian diplomat also said this week that it Moscow had been in contact with the Trump transition team about the ongoing conflict in Syria. Trump's son, Donald Trump Jr. reportedly held private talks with a pro-Russia figure last month about how the two countries could work together to end the civil war.

Critics of the president-elect, including Murphy, have repeatedly voiced concerns about Trump's publicly relationship with Putin.