the rich already pay an exit tax... so there is no need for a new law
expatriating in order to evade taxes already carries a punishment of banning the person from the country... no need for a new on that either.
congresscritter should know current law before they go making up redundant laws.
as it is now, when you renounce your citizenship,and are rich, you are levied a tax on all of your unrealized capital gains... they pretend you sell all of your assets and tax you on the gains ( which is why it's best to leave during a market downturn, as values on assets have fallen)
you are also susceptible to a 30% withholding tax on income.
( of course, you won't be getting all that money you put into SS back... but folks are ok with that too, as expatriates are evil criminals)
it's very expensive to renounce your citizenship...Uncle Sam makes sure you are punished for leaving the US... and somehow, liberals enjoy the thought of punishing people for leaving this society and striking out in a new one.. 'cuz liberals are all about freedom and self determination and stuff.