Trump also said further negotiations with Iran could possibly happen, “but it’s not something we’re looking at”.

The US president initially predicted the war, which is now in its seventh month, would last only a matter of weeks. The conflict, and its knock-on effects on everything from fuel to groceries, has led to a steep decline in his approval ratings – and pressure from those within his party, including devout supporters, to quickly end the war.

Midterm elections will be held on 3 November, and Republicans are in danger of losing their control on Congress.

At the convention, Trump sought to energise the party ahead of November. Historically, a sitting president’s party tends to lose seats in Congress in the midterm elections.

Fighting in the Middle East has intensified in recent days, as oil facilities throughout the region come under attack, driving up the global price of fuel and any item that requires shipping.

The price of oil hit $100 a barrel on Wednesday for the first time since July. Similarly, earlier this week the price of US diesel hit an all-time-high, which is likely to cause a ripple effect on prices across the US.

On Wednesday, the US military said it had attacked five oil tanker ships with ties to Iran. Tehran, in response, launched attacks on two US Navy destroyers and eight oil tankers in the Strait of Hormuz, causing “heavy damage” to the vessels, according to Iranian state media.

A day earlier, the Iran-linked Houthis in Yemen launched a wave of attacks in Saudi Arabia, sparking fires at oil facilities.

The fighting, which began again recently after a 60-day ceasefire between the US and Iran formally expired last month, has also raised predictions that the rising fuel costs could lead to higher interest rates in the US.