Hello from CNN, I'm Joe Beck, with the five things you need to know for Tuesday, July 30th.

As we learn more about the security failures that led to the assassination attempt on former President Donald Trump,

the new acting head of the Secret Service will answer questions from lawmakers today.

Ronald Rowe is expected to tell Congress that the agency is changing how it approves security plans and adding extra protection for people in the wake of the attack.

He visited the site of the shooting in Butler, Pennsylvania earlier this month, saying that what he saw made him ashamed.

Today's hearing comes as text messages and radio chatter between law enforcement officers at the rally have been released by

Senator Chuck Grassley's office. They show that officers knew the shooter was there

and alerted others about it 90 minutes before he climbed onto a roof and fired eight rounds at Trump.

His FBI Special Agent Kevin Roject. A local officer took a photo of the subject

and sent it to other SWAT operators on scene as well as local

command personnel. One of the texts says quote I did see him with a rangefinder

looking towards stage FYI but then officers lost sight of the suspect and he was able to get up onto the roof.

Tensions are very high in Venezuela, after President Nicholas Maduro was declared the winner of the presidential election, despite claims of fraud from the opposition.

Many Venezuelans across the country took to the streets until late last night to protest the disputed results, with security forces using tear gas and

batons to disperse the large crowds.

And videos from across the country show people inside their homes banging pots in a spontaneous

form of protest also used in several Latin American countries.

The new protests are presenting the ruling establishment its toughest challenge in 25 years,

while other Latin American leaders have refused to recognize Maduro's win, and the US has called for more transparency about the vote count.

The US and several other Western countries are urging their citizens to leave Lebanon immediately because of the threat of an Israeli attack.

The State Department has issued a level 3 reconsider travel advisory for Lebanon and a level 4 do not travel advisory specifically for the south of the country.

This follows Israel's warning that the Lebanon-based militant group Hezbollah will quote,

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