President Biden will unveil a new proposal in Nevada on Tuesday to cap rental costs nationwide, according to three people familiar with the matter, as he works to assuage Democratic concerns about the viability of his candidacy while the Republican convention gets underway.

Biden's plan — which would need to be approved by Congress — calls for stripping a tax benefit from landlords who increase their tenants' rent more than 5 percent per year, the people said. The measure would only apply to landlords who own more than 50 units, which represents roughly half of all rental properties, the people said. It wouldn't cover units that have not yet been built, in an attempt to ensure that the policy does not discourage construction of new rental housing. The people spoke on the condition of anonymity to describe a proposal that isn't yet public.