The U.S. is still not doing enough to safeguard its border with Mexico, Sen. John McCainJohn Sidney McCainTrump's America fights back Mellman: Trump can fix it GOP strategist Steve Schmidt denounces party, will vote for Democrats MORE (R-Ariz.) told reporters Thursday.

“The violence level at the border is incredibly high, and we haven’t kept up with that,” McCain said in a news conference, according to the East Valley Tribune.

McCain admitted that border security has somewhat improved, but not enough in the face of rising violence in Mexico. McCain said he was disappointed by last week’s announcement that National Guard troops will leave the border by June and said more, not less, troops were needed there, according to the report.

McCain had just returned from a tour of the border areas in Douglas, Nogales and Yuma along with Arizona GOP Congressmen Jeff FlakeJeffrey (Jeff) Lane FlakeFlake threatens to limit Trump court nominees: report Poll: McSally holds 14-point lead in Arizona GOP Senate primary GOP senators introduce bill to prevent family separations at border MORE, David SchweikertDavid SchweikertMembers of Congress demand new federal gender pay audit Republican candidate favored in Arizona special House election Ryan leaves legacy of tax cuts and deficits MORE, Paul GosarPaul Anthony GosarOvernight Energy: Spending bill targets Pruitt | Ryan not paying 'close attention' to Pruitt controversies | Yellowstone park chief learned of dismissal through press release GOP offshore drilling proposal triggers debate Republican moves on Arizona coal plant show they don’t believe their own rhetoric MORE and Ben Quayle. The tour included a meeting with the widow and brother of Robert Krentz, a rancher slain last year near the border.

McCain said he would reintroduce his 10-point border security plan later this year, which would add troops to the border, enhance the ability of the government to prosecute those who illegally cross the border, and construct a security fence.

“After the border is secure and we can assure our citizens of that, we will be fully prepared to move forward with comprehensive immigration reform,” said McCain.