WASHINGTON — The White House is stepping up its antagonism toward Prime Minister Benjamin Netanyahu despite his victory in this week’s elections, signaling that it is in no rush to repair a historic rift between the United States and Israel.

The sharpened tone indicates that the Obama administration may be re-evaluating its relationship with its closest ally in the Middle East, having lost patience with Mr. Netanyahu in the closing days of an election campaign in which he spotlighted deep disagreements with President Obama over a Palestinian state and a nuclear deal with Iran.

“You reach a tipping point,” said Daniel C. Kurtzer, a former American ambassador to Israel and Egypt. “It’s the culmination of six and a half years of frustration, including some direct hits at the president’s prestige and the office of the presidency.”

The aggressiveness underlines a calculation by Mr. Obama that an international accord with Iran to rein in its nuclear program is within reach despite Mr. Netanyahu’s adamant opposition, and that there is little value in being more conciliatory toward him.