In the United States, accusations of Russian meddling in the presidential election have resurfaced - this time, regarding the 2020 campaign.

Democratic presidential hopeful Bernie Sanders has warned Russia to stay out of the 2020 presidential election.

He was responding to reports that intelligence officials had warned him the Kremlin was meddling to boost his campaign, as well as that of President Donald Trump.

Russia has denied the accusations.

Al Jazeera's Sara Khairat reports.