Israel annexed the Golan in 1981 in a move not recognised internationally.
About 20,000 Israeli settlers live in the Golan, which overlooks Syrian territory.
The move comes after the US State Department dropped the word "occupied" in relation to the Golan Heights in its annual human rights report for 2018, published last week.
The South Carolina politican made his pledge during a tour of the frontier with Netanyahu and US Ambassador to Israel David Friedman.
President Trump wrote on Twitter that Israel should have full sovereignty over the Golan Heights, which Israel seized from Syria during the 1967 Six-Day War.
"Attempts by the U.S.to legitimize Israel's actions against global law will only lead to more violence and pain in the region", Çavuşoğlu wrote in a tweet.
However, Leon Panetta a veteran Democrat who served as Central Intelligence Agency director and defense secretary, among other roles, blasted Trump for "tweeting out another policy that obviously has not been worked out with our worldwide partners".
While serving in Congress, O'Rourke was very supportive of the controversial Iranian nuclear deal, which the United States pulled out of past year under the leadership of President Donald Trump.
Trump's abrupt announcement was immediately cheered by Netanyahu, who faces a tough reelection battle and visits Washington next week.
A statement from the Syrian Foreign Ministry previously said that according to the United Nations, the Golan Heights are considered Syrian occupied lands.
"The US government's @realDonaldTrump attempts to legitimate Israel's illegal actions towards Golan Heights mean nothing but supporting Israel's policy of occupation and deepening the conflict in the region", Kalın added. Pompeo's words gave a public boost to the Israeli leader at the height of a tight re-election campaign.
Israel has long considered all of Jerusalem as its eternal, indivisible capital, while Palestinians want East Jerusalem as the capital of a future state they seek in territory Israel took in the June 1967 war.
Panetta, who was speaking on CNN, said the Golan recognition "gives up one of the chips that everyone thought would be part of a Middle East peace agreement deal". President Michel Aoun called Hezbollah's arms "an essential part of defending Lebanon", though Prime Minister Saad al-Hariri said its weapons were illegitimate.
"It is in the hands of Israel and will always remain in the hands of Israel", he said at the time.