State of the Union: As it happened - BBC News
Mr Trump had appeared to snub a handshake from the senior Democrat before the State of the Union.
President Trump said that, for the first time in 51 years, "the cost of prescription drugs actually went down".

In the year to May 2019, the average monthly cost of prescription drugs fell by 0.2% according to the Bureau of Labour Statistics' Consumer Price Index (CPI), which measures the increase in the cost of household items in the US .

This is the first price decrease over a 12-month period since 1973, some 47 years ago.

But this may not be the most reliable way to measure drug prices according to Inma Hernandez, a pharmacy lecturer at the University of Pittsburgh.

"The CPI is based on a basket of drugs which is representative of popular drugs. So it tends to include widely-used drugs, which are usually cheaper," she says.

"However, it is less likely to include newer or less-prescribed drugs, which are more expensive and have higher price increases."

The lack of transparency around drug pricing makes it very difficult to know exactly what's happening to the cost of prescription medication.