According to a senior official in the U.K. government, Johnson has resolved on a hard-line plan as he prepares for his first face-to-face negotiations with European Commission President Jean-Claude Juncker on Monday.
Rouhani said he hoped Johnson's "only one visit to Tehran" while serving as UK foreign secretary in 2017 and now his tenure as prime minister lead to a "further deepening of bilateral and multilateral relations."
Temperature records that had stood for decades or even just hours fell minute by minute in July and Europeans and tourists alike jumped into fountains, lakes, rivers or the sea to escape a suffocating heat wave rising up from the Sahara.
Johnson is admired by many Conservatives for his ability to connect with voters, but others mistrust him for his long record of misleading and false statements, verbal blunders and erratic performance.
PM Modi arrived in United Kingdom on Wednesday for the second leg of his three-nation visit. Modi met his British counterpart Theresa May in London and had wide-ranging talks on redefining and infusing new energy into bilateral engagement post-Brexit.