Republican opponents argue that revoking the two authorizations would signal American weakness to Iran

Such a resolution easier to pass in Senate, only needing 10 republicans, but would not carry with it vote on whether to bar former president from holding future public office

President has promised to veto war powers resolution, warns that if his 'hands were tied, Iran would have a field day'

Senator Tim Kaine says 4 Republicans are willing to support bill requiring Trump to seek authority from Congress if military hostilities with Iran last more than 30 days

Nonbinding statement affirming Congress role in declaring war passed the House last week; Republican leader McConnell urges Democrats not to 'screw up' US deterrence in Mideast

US president facing competing urges of keeping up pressure on Tehran to negotiate while deterring any further Iranian attacks and avoiding another Middle East war

Resolution, brought by Republican Ted Cruz and Democrat Tim Kaine, notes 'Jews are the targets of the majority of hate crimes committed in the United States'

As White House escalates tensions, Democratic senators and groups call for legislation disallowing an attack on Iran without Congressional approval