Although Democratic presidential candidate Joe Biden puts on a show of being the “best friend” of former President Barack Obama, facts are accumulating that makes one think that the relationship between the two has been complicated, affecting the Democratic Party.

Although at the Democratic National Convention that begins today, Aug. 17, Biden will be officially named the party’s candidate for president, and the Obamas will make speeches, the Democratic Party has been affected by the difficulties of the Biden-Obama relationship, according to Politico.

It seems that since the first meetings between the two there have been setbacks, one of which is told by the writer Steven Levingston in a book on this relationship.

On one of those occasions, Biden is said to have made a long speech that Obama was frustrated with, to the point of writing to one of his advisers “shoot me now,” according to Livingston.

Later in his tenure as vice president, Biden does not appear to have been very successful in working with President Obama, as can be seen from the testimony of FBI former Director James Comey in his book on the Obama era.

“Obama would have a series of exchanges leading to a very clear and sharp conversation in the A direction. Then, at some point, Biden would jump in with: ‘May I ask a question, Mr. President,'” Comey wrote.

“Obama would politely agree, but something in his expression suggested that he knew very well that for the next five or 10 minutes we would all be heading in Direction Z. After listening and waiting patiently, President Obama would restart the conversation,” Comey added, according to Politico.

Obama did not support Biden in the 2016 presidential race and instead embraced Hillary Clinton in a way that Biden’s supporters have not forgotten.

Also, “Obama urged Biden not to run for president in 2016 and didn’t think he was tough enough to take on Hillary. He again tried to convince Biden not to run in 2020, and only endorsed Biden after every other candidate had dropped out,” said Trump’s Campaign Communications Director Tim Murtaugh, according to the Daily Caller.

“Now that Biden is the only candidate left in the Democrat field, Obama has no choice but to support him. Even Bernie Sanders beat him to it,” then-Republican Campaign Manager Brad Parscale said in an April 14 statement.

Another account of the disagreements between Biden and Obama says Biden was loyal to the relationship anyway.

“He was loyal, I think, to Obama in every way in terms of defending and standing by him, even probably when he disagreed with what Obama was doing,” said Leon Panetta, Obama’s defense secretary, according to Politico.

He added, “To some extent, [he] oftentimes felt that that loyalty was not being rewarded.”