WASHINGTON, D.C. — In a surprising turn of events, President Joe Biden has humorously assigned Rishi Sunak, the British Prime Minister, a new title that doesn’t even exist within the United Kingdom. This lighthearted incident occurred during Sunak’s inaugural visit to the White House, showcasing the often amusing cultural differences between American and British political customs.

During their first meeting on Thursday, Biden mistakenly referred to Sunak as “Mr. president,” prompting a friendly correction from the British leader. Sunak smiled while Biden quickly rectified his slip, saying, “Mr. prime minister, it’s great to have you back.” This moment not only lightened the atmosphere but also highlighted the unique nuances in titles and honorifics between the two nations.

Experts in British constitutional law may find this mix-up problematic, as it challenges the established norms regarding the hierarchy of leadership. In the U.K., the Prime Minister is traditionally viewed as the “first” or most senior of the king’s ministers, known as the first among equals, which is a significant distinction that underscores the unique structure of British governance.

Despite the initial gaffe, both leaders seemed relaxed and engaged during their discussions on Sunak’s second full day in Washington, D.C. Their meeting was characterized by a friendly rapport, demonstrating the importance of maintaining good diplomatic relations even amid minor blunders.

Journalists were granted access to the first ten minutes of their conversation in the Oval Office, where they addressed pressing global issues, including the “brutal invasion” of Ukraine and the rapid advancements in artificial intelligence that are transforming societies worldwide.

Following this initial exchange, the two leaders engaged in more than an hour of private discussions, which included 40 minutes of one-on-one dialogue. This extended conversation allowed them to delve deeper into the topics of mutual interest, reinforcing the significance of their ongoing collaboration.

After the meeting, Biden gave reporters a thumbs-up, indicating that the so-called “special relationship” between the United States and Britain remains strong and in “real good shape.” He emphasized their joint efforts, stating, “Together, we are providing economic and humanitarian aid and security systems to Ukraine in their fight against a brutal invasion from Russia,” highlighting the unity in addressing global challenges.

Before diving into substantive matters, both leaders shared a lighthearted moment, reminiscing about some of their more colorful predecessors. Biden recounted the legendary wartime stay of former Prime Minister Winston Churchill at the White House, where First Lady Eleanor Roosevelt supposedly prevented Churchill from entering her husband Franklin’s bedroom at 3 a.m. Sunak humorously responded, “Sir, don’t worry — you won’t see me there, bothering you and the first lady,” showcasing their ability to blend humor with serious discussions.

Sunak further reflected on the historical significance of the Oval Office, stating, “It’s daunting to think of the conversations that our predecessors had in this room when they had to speak of wars that they fought together, peace won together, incredible change in the lives of our citizens.” This acknowledgment of history underscores the profound legacy of U.S.-U.K. relations and the responsibilities they share in shaping a better future.