It is unclear how long Trump's polling bump will last. Polls tend to be lagging indicators, meaning they reflect events from the recent past rather than the present.
Many of the polls were conducted last week, when Trump adopted a noticeably more serious tone when discussing the pandemic. This week he has again reverted to minimising the virus and has flagged a return to normal life by Easter, an idea vigorously opposed by public health experts.
Rather than being surprised by Trump's popularity boost, some long-time poll watchers say it should be even bigger. In times of national emergency, citizens tend to support their leaders - a phenomenon known as the "rally around the flag" effect.