diff --git a/crates/hotshot/src/tasks/mod.rs b/crates/hotshot/src/tasks/mod.rs
index dbaa964bc8..a28d32d260 100644
--- a/crates/hotshot/src/tasks/mod.rs
+++ b/crates/hotshot/src/tasks/mod.rs
@@ -25,6 +25,8 @@ use hotshot_task_impls::{
 };
 use hotshot_types::{
     constants::EVENT_CHANNEL_SIZE,
+    data::QuorumProposal,
+    message::Proposal,
     message::{Messages, VersionedMessage},
     traits::{
         network::ConnectedNetwork,
@@ -364,6 +366,83 @@ impl<TYPES: NodeType, I: NodeImplementation<TYPES>> EventTransformerState<TYPES,
     }
 }
 
+#[derive(Debug)]
+/// An `EventHandlerState` that modifies justify_qc to that of previous view to mock dishonest leader
+pub struct DishonestLeader<TYPES: NodeType, I: NodeImplementation<TYPES>> {
+    /// store events from previous views
+    cached_events: Vec<HotShotEvent<TYPES>>,
+    /// phantom
+    _phantom: std::marker::PhantomData<I>,
+}
+
+/// add trait to handle proposal events for a dishonest leader
+trait DishonestProposal<TYPES: NodeType, I: NodeImplementation<TYPES>> {
+    /// send dishonest proposal
+    fn handle_proposal_send_event(
+        &self,
+        event: &HotShotEvent<TYPES>,
+        proposal: &Proposal<TYPES, QuorumProposal<TYPES>>,
+        sender: &TYPES::SignatureKey,
+    ) -> Vec<HotShotEvent<TYPES>>;
+}
+
+impl<TYPES: NodeType, I: NodeImplementation<TYPES>> Default for DishonestLeader<TYPES, I> {
+    /// create a dishonest leader that stores past events to try a modify a view when they are the leader
+    fn default() -> Self {
+        DishonestLeader {
+            cached_events: Vec::new(),
+            _phantom: std::marker::PhantomData,
+        }
+    }
+}
+
+impl<TYPES: NodeType, I: NodeImplementation<TYPES>> DishonestProposal<TYPES, I>
+    for DishonestLeader<TYPES, I>
+{
+    fn handle_proposal_send_event(
+        &self,
+        event: &HotShotEvent<TYPES>,
+        proposal: &Proposal<TYPES, QuorumProposal<TYPES>>,
+        sender: &TYPES::SignatureKey,
+    ) -> Vec<HotShotEvent<TYPES>> {
+        let dishonest = self.cached_events.len() == 2;
+        if !dishonest {
+            return vec![event.clone()];
+        }
+
+        match self.cached_events.first().unwrap().clone() {
+            HotShotEvent::QuorumProposalSend(cached_proposal, _cached_sender) => {
+                let mut dishonest_proposal = proposal.clone();
+                dishonest_proposal.data.justify_qc = cached_proposal.data.justify_qc;
+
+                let dishonest_proposal_event =
+                    HotShotEvent::QuorumProposalSend(dishonest_proposal, sender.clone());
+                vec![dishonest_proposal_event]
+            }
+            _ => vec![event.clone()],
+        }
+    }
+}
+
+#[async_trait]
+impl<TYPES: NodeType, I: NodeImplementation<TYPES> + std::fmt::Debug>
+    EventTransformerState<TYPES, I> for DishonestLeader<TYPES, I>
+{
+    async fn recv_handler(&mut self, event: &HotShotEvent<TYPES>) -> Vec<HotShotEvent<TYPES>> {
+        vec![event.clone()]
+    }
+
+    async fn send_handler(&mut self, event: &HotShotEvent<TYPES>) -> Vec<HotShotEvent<TYPES>> {
+        match event {
+            HotShotEvent::QuorumProposalSend(proposal, sender) => {
+                self.cached_events.push(event.clone());
+                self.handle_proposal_send_event(event, proposal, sender)
+            }
+            _ => vec![event.clone()],
+        }
+    }
+}
+
 /// adds tasks for sending/receiving messages to/from the network.
 pub async fn add_network_tasks<TYPES: NodeType, I: NodeImplementation<TYPES>>(
     handle: &mut SystemContextHandle<TYPES, I>,
diff --git a/crates/testing/tests/tests_1/test_with_failures_2.rs b/crates/testing/tests/tests_1/test_with_failures_2.rs
index cb9acd9dc5..66251e1c92 100644
--- a/crates/testing/tests/tests_1/test_with_failures_2.rs
+++ b/crates/testing/tests/tests_1/test_with_failures_2.rs
@@ -1,6 +1,5 @@
 // TODO: Remove this after integration
 #![allow(unused_imports)]
-
 use hotshot_example_types::{
     node_types::{Libp2pImpl, MemoryImpl, PushCdnImpl},
     state_types::TestTypes,
@@ -8,9 +7,14 @@ use hotshot_example_types::{
 use hotshot_macros::cross_tests;
 use hotshot_testing::{
     block_builder::SimpleBuilderImplementation,
+    completion_task::{CompletionTaskDescription, TimeBasedCompletionTaskDescription},
     spinning_task::{ChangeNode, SpinningTaskDescription, UpDown},
     test_builder::TestDescription,
 };
+use std::time::Duration;
+
+#[cfg(async_executor_impl = "async-std")]
+use {hotshot::tasks::DishonestLeader, hotshot_testing::test_builder::Behaviour, std::rc::Rc};
 // Test that a good leader can succeed in the view directly after view sync
 #[cfg(not(feature = "dependency-tasks"))]
 cross_tests!(
@@ -52,3 +56,34 @@ cross_tests!(
         metadata
     }
 );
+
+#[cfg(async_executor_impl = "async-std")]
+cross_tests!(
+    TestName: dishonest_leader,
+    Impls: [MemoryImpl],
+    Types: [TestTypes],
+    Ignore: false,
+    Metadata: {
+        let behaviour = Rc::new(|node_id| {
+                let dishonest_leader = DishonestLeader::<TestTypes, MemoryImpl>::default();
+                match node_id {
+                    2 => Behaviour::Byzantine(Box::new(dishonest_leader)),
+                    _ => Behaviour::Standard,
+                }
+            });
+
+        let mut metadata = TestDescription {
+            // allow more time to pass in CI
+            completion_task_description: CompletionTaskDescription::TimeBasedCompletionTaskBuilder(
+                                             TimeBasedCompletionTaskDescription {
+                                                 duration: Duration::from_secs(60),
+                                             },
+                                         ),
+            behaviour,
+            ..TestDescription::default()
+        };
+
+        metadata.overall_safety_properties.num_failed_views = 1;
+        metadata
+    },
+);