louisville ky. republican presidential candidate donald trump assure gun owners friday would protect constitutional right bear arm eliminate gun-free zone elect accuse democrat hillary clinton want weaken gun right trump almost certainly republican presidential nominee pick endorsement national rifle association politically powerful lobby group claim million members trump remark nra national convention louisville kentucky surprise could solidify status among conservatives see protect u.s. constitution second amendment top priority trump also plan meet monday u.s. senator bob corker tennessee source close trump campaign say two expect consult foreign policy source say corker remain trump list potential vice presidential run mat clinton close clinch democratic party nomination nov. election vow take gun lobby expand gun control measure include comprehensive background check gun buyers include open-air gun show online trump try unite republican party behind brutal primary battle accuse clinton former secretary state president barack obama want end 2nd amendment say part people right keep bear arm shall infringe hillary clinton want abolish second amendment change want abolish trump say clinton campaign senior policy adviser maya harris say trump peddle falsehoods denounce donald trump conspiracy theories say clinton believe common-sense step take federal level keep gun hand criminals protect second amendment trump tell nra would eliminate gun-free zone impose areas note 2015 shoot deaths four u.s. marines arm force recruit center chattanooga tennessee take place gun-free zone second amendment ballot november say way save second amendment vote person know donald trump nra convention take place day man brandish gun checkpoint near white house washington shoot wound law enforcement officer new york billionaire nra speech another step drive make conservatives comfortable candidacy early week release list 11 potential supreme court nominees conservative jurists step well-received right many conservatives back republican candidates 2016 race worry trump closet liberal many issue chris cox executive director nra institute legislative action say time get qualms 69-year-old candidate prefer candidate race time get cox tell nra audience valid arguments favor others sure matter hillary win november one bite another step toward try unify party cox invite members congress small roundtable discussion one trump sons donald trump jr. wednesday capitol hill club near u.s. capitol copy invitation say trump rally gun owners fiery anti-clinton speech